Topic: rectangle

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Ambiguous Cylinder Illusion by Kokichi Sugihara

Second place winner of the Best Illusion of the Year Contest 2016, this is the Ambiguous Cylinder Illusion by mathematics professor Kokichi Sugihara of Meiji University in Tokyo, Japan. The direct views of the obj...

Mathematical Present Wrapping with Katie Steckles

When you're wrapping a variety of shapes, it can be a challenge to wrap them neatly, but with a bit of measuring, thoughtful folding, and practice, your cuboid, pentahedron or equilateral triangular prism, cylinder, o...

How to draw a Penrose Rectangle & other impossible objects

The Penrose Rectangle is what’s known as an impossible object, an optical illusion that is drawn to look like a three-dimensional thing that could never actually exist. If it’s hard to see at first, cover ...

Classic Sesame Street: Changing shapes

A Sesame Street classic: Circle to square to triangle to rectangle… but don’t stop there! Watch more videos about shapes and, of course, more Sesame Street.