Mobius Strips

More about Vi Hart,, Flatlands and Mobius strips- here:

If you haven't read the book Flatlands - here is something similar - - but the Flatlands book implies a possibility of the fourth dimension. I, personally, do not care much for this video.

Finally - here is a TED talks on dimensions:


Building in 3D Activity:

OK- if you got this far, here is one more: