Wednesday, October 31, 2007

Inside out

Thanks to Bee at Backreaction comes this fantastic video illustrating how a sphere can be turned inside out. It's around 20 minutes long and you're not actually going to learn much solid mathematics, but the process is very very well explained and the animation is excellent.


Doug said...

This is a magnificent dynamic illustration.

But is appears that simply the inner and outer surfaces of the circumference of the 3-ball are being exchange, not the inside and outside volumes?

Unknown said...

I'm not sure I see how you can exchange one part of the inside without exchanging all of it. Indeed this is not a 3-ball but a 2-sphere. There is only a surface, no volume.