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Triangle, Square, Circle: A Psychological Test

1. Fill in these three forms with one of the the primary colors: red, yellow, or blue. The coloring is to fill the form entirely in each case. One color per shape.

triangle circle square

2. If possible, provide an explanation for your choice of color.


In 1923 Wassily Kandinsky circulated a questionnaire at the Bauhaus, asking respondents to fill in a triangle, square, and circle witht he primary colors of red, yellow, and blue. He hoped to discover a universal correspondence between form and color, embodied in the equation red=square, yellow=triangle, blue=circle.


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Euclid – geometry



Postulate 1 ‘[It is possible] to draw a straight line from any point to any point’.

Postulate 2 ‘[It is possible] to produce a finite straight line continuously in a straight line’.

Postulate 3 ‘[It is possible] to describe a circle with any centre and diameter’.


Euclid’s theorems are still true and his methods are still admired. For millenia his books have been studied and referenced, though they are no longer used as a school text-book.53 He entitled his principal work Elements, and it was intended to be a foundational work in the subject, a starting point. The same Greek word (stoikheia) also means the letters in the alphabet, and Euclid’s elements are to geometry what letters are to language: the building blocks or basic components.

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