Tea Bag Folding

Background and general instructions:
http://britton.disted.camosun.bc.ca/jbteabagtiles.htm

Simple folding instructions:
http://www.origami-resource-center.com/tea-bag-folding.html

Printable paper:
http://zrosemarie.50webs.com/

Optical Illusions and Impossible Objects

Dragon's Head:
http://www.grand-illusions.com/images/articles/opticalillusions/dragon_illusion/dragon.pdf

Assorted models including impossible triangle:
http://www.geocities.jp/ikemath/album/illusion.html

Jacob's Ladder:
http://www.instructables.com/id/Unbelievable-!-Optical-Paper-Illusion-Toy-!/