goodbye blue sky
Laura, 20. Design student
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design-is-fine:

Theo van Doesburg & Cornelis van Eesteren, Perspective with final colour design, Shopping arcade with bar-restaurant, Laan van Meerdervoort, The Hague 1924. Netherlands Architecture Institute. Via Tate
matthen:

Unrolling these circles gives fills a triangle with base 2 π r and height r (where r is the radius of the filled disk). Such a triangle has area π r2. This does not serve as a complete proof for why this is the area of a circle, but can give you some intuition for why it should be. [code]
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visualgraphc:

Prevention September 2014 - Ryo Takemasa

,
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mentaltimetraveller:

Matt Sheridan Smith