
The candle problem, also known as Duncker's candle problem, is a cognitive performance test that measures the influence of functional fixedness on a person's problem-solving abilities. The test presents participants with the task of fixing and lighting a candle on a wall without allowing wax to drip onto the table below. While the most efficient solution involves using the box of thumbtacks to hold the candle and affixing it to the wall, many people fail to solve the problem due to functional fixedness, which causes them to perceive the box solely as a container rather than considering its alternative uses.
| Characteristics | Values |
|---|---|
| Year of creation | 1935 or 1945 |
| Creator | Gestalt psychologist Karl Duncker |
| Purpose | To measure the influence of functional fixedness on a participant's problem-solving capabilities |
| Task | Fix and light a candle on a wall (a cork board) without allowing wax to drip onto the table below |
| Objects provided | Candle, box of thumbtacks or drawing pins, and a book of matches |
| Optimal solution | Empty the box of thumbtacks, use them to nail the box to the wall, put the candle into the box, and light the candle |
| Common issue with participants | Functional fixedness, i.e., they only saw the box as a container for thumbtacks and not as a separate functional component |
| Effect of monetary incentives | Participants offered monetary incentives took longer to solve the problem |
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What You'll Learn

Functional fixedness
The candle problem, also known as Duncker's candle problem, is a classic experiment used to measure functional fixedness. The term functional fixedness was coined by German-American psychologist Karl Duncker, who developed the candle problem in 1945.
The candle problem involves presenting participants with the following task: how to fix and light a candle on a wall (often a cork board) so that the candle wax won't drip onto the table below. To solve the problem, participants are given a candle, a box of thumbtacks or drawing pins, and a book of matches. The most efficient solution is to empty the box of thumbtacks, use the thumbtacks to nail the box to the wall, put the candle into the box, and light the candle with the match.
However, due to functional fixedness, many people struggle to solve this problem. Functional fixedness is a cognitive bias that limits a person's ability to use an object in a way that is not its traditional use. In the case of the candle problem, participants tend to see the box only as a container for the thumbtacks and fail to consider that it could be used as a candle holder. This phenomenon can hinder the development of new ideas and innovative solutions, not just in puzzle-solving contexts like the candle problem, but also in fields such as business, design, and education.
In business, for example, functional fixedness may lead to the repeated application of proven approaches, preventing progress. To overcome this, businesses may need to embrace unconventional ideas and thinking outside the box to stay competitive and foster sustainable practices. Similarly, in design, understanding functional fixedness can lead to more innovative solutions by challenging the conventional uses of objects. In education, encouraging students to overcome functional fixedness can help them develop their creative thinking and problem-solving skills.
Interestingly, some studies have found that offering incentives for solving the candle problem can make it more difficult for people to think creatively, leading to longer solution times. This suggests that when the problem requires creative thinking, incentives may create undue pressure and hinder performance.
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The influence of incentives
The candle problem, also known as Duncker's candle problem, is a cognitive performance test that measures the influence of incentives on problem-solving capabilities. The test was created by Gestalt psychologist Karl Duncker and first presented in his 1935 thesis on problem-solving tasks at Clark University.
In the test, participants are given a candle, a box of thumbtacks, and a few matches. Their task is to fix the candle to a wall without allowing wax to drip onto the table below. The most efficient solution is to empty the box of thumbtacks, use them to nail the box to the wall, place the candle inside the box, and light it with a match. However, due to a cognitive bias called functional fixedness, many participants fail to solve the task as they perceive the box only as a container for the thumbtacks and struggle to see it as a potential candle holder.
However, Glucksberg modified the problem, and in this variation, the subjects offered an incentive performed better than the control group. This indicates that incentives can be beneficial in certain contexts, such as when the task has a clear and obvious solution. For example, if the tacks are presented outside the box, participants can easily see their alternative use and are more likely to arrive at the optimal solution.
The candle problem has been used to understand the impact of functional fixedness on creativity and innovation. Overcoming this cognitive bias is crucial for fostering creative thinking and finding innovative solutions, especially in fields like design and business. By consciously abstracting, brainstorming, and thinking outside the box, individuals and organizations can enhance their problem-solving capabilities and discover fresh ideas.
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Overlooking the box as a tool
The candle problem, also known as Duncker's candle problem, is a cognitive performance test that measures the influence of functional fixedness on a participant's problem-solving capabilities. The test involves a candle, a box of thumbtacks, and a book of matches. The challenge is to affix the lit candle to a wall so that it won't drip wax onto the table below, using only the items provided.
The concept of functional fixedness predicts that participants will perceive the box solely as a container for the thumbtacks, overlooking its potential as a tool to solve the problem. This phenomenon is known as "overlooking the box as a tool." Many people who attempted the test explored other creative but less efficient methods, such as trying to tack the candle directly to the wall or using melted wax as an adhesive, instead of recognising that the box itself could be used to hold the candle.
This tendency to overlook the box as a tool can be attributed to the constraints of our design space and the restrictions in our perspective. We often approach problems with an "if x, then do y to get z" mindset, relying on familiar and straightforward paths to completion. To truly think outside the box, it is crucial to focus on overlooked aspects of the problem, challenge assumptions, and seek alternative ways of thinking, rather than settling for predictable solutions.
By encouraging outside-the-box thinking, individuals and teams can boost creativity and solve complex problems. This involves creating an environment that fosters psychological safety and openness to new ideas. Techniques such as brainstorming, role-playing, and mind mapping can stimulate creative thinking and help uncover innovative solutions.
Additionally, it is important to recognise that thinking outside the box requires a willingness to challenge one's own thinking and re-examine established beliefs, which can be uncomfortable and even threatening. However, by embracing diverse perspectives and staying open to unconventional ideas, we can enhance our problem-solving capabilities and find fresh solutions that may have been previously overlooked.
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Creative, alternative uses
The candle problem, also known as Duncker's candle problem, is a cognitive performance test that measures the influence of functional fixedness on a person's problem-solving capabilities. The test presents participants with the task of fixing and lighting a candle on a wall (a corkboard) without allowing the candle wax to drip onto the table below. Along with the candle, participants are given a box of thumbtacks and a book of matches.
The most efficient solution involves emptying the box of thumbtacks, using them to nail the box to the wall, placing the candle inside the box, and lighting the candle with a match. However, due to functional fixedness, many people struggle to see beyond the box's initial purpose as a container for the thumbtacks and fail to consider its alternative use as a candle holder.
- The Box - Instead of using the box solely as a container, it can be transformed into a decorative piece by covering it with fabric, paint, or paper. It can then be used to store items on a shelf or be hung on the wall as a unique display.
- Thumbtacks - Thumbtacks can be used creatively to create patterns or designs on a corkboard or bulletin board. By arranging them in different shapes or colours, you can create a piece of art or a functional calendar or planner.
- Candle - Aside from providing light, candles can be used for their wax. Candle wax can be melted and used for a variety of purposes, such as making homemade candles, creating wax seals for envelopes, or even as a lubricant for sticky mechanisms.
- Matches - Matches are not just for lighting fires or candles. They can be used in survival situations to start a fire for warmth and cooking. In creative fields, matches can be incorporated into art projects, such as creating matchstick models or using the striking surface to create sparkler effects in photography.
These alternative uses for the items in the candle problem showcase the importance of thinking beyond the traditional functions of objects. By embracing creative and unconventional ideas, we can enhance our problem-solving skills and explore new horizons in various fields, including psychology, design, and innovation.
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Problem-solving and decision-making abilities
The candle problem is a classic experiment used to measure functional fixedness, a cognitive bias that limits a person's ability to use an object only in the way it is traditionally used. The term was coined by German-American psychologist Karl Duncker, who developed the candle problem in the 1940s.
In the candle problem, individuals are given a box of thumbtacks, a candle, and a book of matches, and are asked to affix the lit candle to a wall so that it will not drip wax onto the table below. The most efficient solution is to empty the box of thumbtacks, use the thumbtacks to nail the box to the wall, put the candle into the box, and light the candle with the match. However, due to functional fixedness, many people struggle to see the box as anything other than a container for the thumbtacks and fail to solve the problem.
Functional fixedness is a prevalent phenomenon that can hinder the development of new ideas and innovative solutions. It is essential to understand this bias to foster creative thinking and problem-solving abilities. By consciously abstracting, brainstorming, and thinking outside the box, individuals can improve their problem-solving skills and make better decisions by considering alternative uses for objects or solutions beyond their standard functions.
Incentives or rewards can also impact problem-solving abilities. Interestingly, studies have shown that offering monetary incentives for quick solutions to the candle problem resulted in participants taking longer to solve it. This suggests that incentives can act as a mental block, making it harder for people to think creatively. However, when the incentive was modified to reward the most efficient solution, participants performed better.
Overcoming functional fixedness is crucial for success in competitive and innovative fields. By encouraging alternative thinking and challenging conventional ideas, individuals and businesses can enhance their problem-solving and decision-making abilities, leading to fresh perspectives and successful outcomes.
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Frequently asked questions
The box-candle test, also known as Duncker's candle problem, is a cognitive performance test that measures the influence of functional fixedness on a participant's problem-solving capabilities. The test presents the participant with the following task: how to fix and light a candle on a wall (a corkboard) in a way so the candle wax won't drip onto the table below.
The most efficient solution is to empty the box of thumbtacks, use the thumbtacks to nail the box to the wall, put the candle into the box, and light the candle with the match.
Due to functional fixedness, participants tend to see the box only as a container for the thumbtacks and fail to consider that the box might have another use, such as a holder for the candle.
Interestingly, the presence of incentives such as monetary rewards for solving the problem quickly tends to result in poorer performance. Glucksberg (1962) found that subjects who were offered a monetary incentive took 3.5 minutes longer to solve the problem than those who weren't.
The box-candle test serves as a reminder that functional fixedness can hinder the development of new ideas and innovative solutions. Overcoming this thinking trap is crucial for success in various fields, especially in competitive and innovative industries. By consciously thinking outside the box, individuals and businesses can foster creativity and explore new horizons.

















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