This paper folding sketch was inspired by a Geometry Daily piece, #76 Peeling Off. ([url]http://geometrydaily.tumblr.com/post/19399785927/76-peeling-off-a-new-minimal-geometric[/url]) I got quite curious about the movement of the folded corners, so made them traceable.
More GeoGebra at [url]http://mathhombre.blogspot.com[/url]