Resources: Observation and Inference
The Mobius Strip - A surface that has one side and one edge. Prove it to yourself by tracing the side and edge. Cut it in half; you don't get two pieces!
http://en.wikipedia.org/wiki/M%C3%B6bius_strip
http://mathworld.wolfram.com/MoebiusStrip.html
The
Mathematical Art of M.C. Escher
(see "Mobius Strip II" (32k) - "marching ants")
The Exploratorium's Online Exhibits
, featuring
Changing Illusions
, among other optical illusions
NIEHS Kids Page -
Optical Illusions
Optical illusion
from Wikipedia, the free encyclopedia