Question:
Which of the following is/ARE considered "Impossible triangle"?
Which of the following is/ARE considered "Impossible triangle"?
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Recall the three-beam figure whose local corners look possible but whose complete three-dimensional structure is contradictory. Do not confuse it with an illusory-contour triangle.
Updated On: Aug 14, 2026
- Kanizsa triangle
- Linear Perspective
- Barmoda triangle
- Color triangle
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The Correct Option is B
Approach Solution - 1
Step 1: Understanding the Question:
The question asks to identify which of the given options is known as an "Impossible triangle." This refers to a type of optical illusion known as an impossible object.
Step 2: Detailed Explanation:
The Penrose triangle is the correct term for the "Impossible triangle."
The question asks to identify which of the given options is known as an "Impossible triangle." This refers to a type of optical illusion known as an impossible object.
Step 2: Detailed Explanation:
- (A) Kanizsa triangle: This is an optical illusion that creates illusory contours, suggesting a triangle that is not actually there. It's an illusion of perception, but not an impossible object.
- (B) Penrose triangle: This is the quintessential "impossible triangle" or "impossible tribar." It is a two-dimensional drawing of an object that cannot exist in three-dimensional space. It was first created by the Swedish artist Oscar Reutersvärd and later independently devised and popularized by Lionel and Roger Penrose.
- (C) Barmoda triangle: This appears to be a misspelling or a distractor term. It does not correspond to any known geometric figure or optical illusion.
- (D) Color triangle: This is a term from color theory, used to represent the relationships between colors, and has nothing to do with impossible objects.
The Penrose triangle is the correct term for the "Impossible triangle."
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Approach Solution -2
Concept:
Step 1: Identify the defining feature.
The three beams appear to meet normally at each corner, but their depth relationships contradict one another when the whole figure is viewed.
Step 2: Match the feature to the standard name.
This three-sided impossible construction is the Penrose triangle, popularised by Lionel and Roger Penrose.
Step 3: Separate it from other triangle illusions.
The Kanizsa triangle creates illusory contours but is not an impossible three-dimensional object. Linear perspective is a drawing system, not the name of the impossible triangle.
Final Answer: The impossible triangle is the Penrose triangle.
- An impossible object can be drawn in two dimensions but cannot be constructed consistently in three-dimensional space.
- The impossible triangle is also called the impossible tribar.
Step 1: Identify the defining feature.
The three beams appear to meet normally at each corner, but their depth relationships contradict one another when the whole figure is viewed.
Step 2: Match the feature to the standard name.
This three-sided impossible construction is the Penrose triangle, popularised by Lionel and Roger Penrose.
Step 3: Separate it from other triangle illusions.
The Kanizsa triangle creates illusory contours but is not an impossible three-dimensional object. Linear perspective is a drawing system, not the name of the impossible triangle.
Final Answer: The impossible triangle is the Penrose triangle.
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