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theapocalypticalgorithm:

atomandbrad:
041214 // untitled - 019/365
mathani:

Get you best paper, cut a circle and fold it so that the circumference falls on a fixed point inside. Repeat, using random folds. Now see the creases. This is how you paper-fold an ellipse.
mathani:

This puzzle consists of four hinged pieces which can be folded one way to a square and the other way to an equilateral triangle. Master puzzler Henry Dudeney demonstrated a wooden model before the London Royal Society in 1905.
beesandbombs:

squares
beesandbombs:

lots of triangles
beesandbombs:

shrinking squares
beesandbombs:

weavers
beesandbombs:

splitting disks
beesandbombs:

rainbow spinners
beesandbombs:

weaving stars
beesandbombs:

more stars / hexagons
beesandbombs:

shrinking triangles
beesandbombs:

wheel forever
beesandbombs:

blue pyramids