signs symbol - optical illusions - Public Domain clip art at WPClipart

Signs and Symbols Section - Clipart of signs, symbols, pointers, targets, etc.

illusions 2 13 images	cafe wall illusion lines are parallel 540x347	duck rabbit illusion 474x295	Ehrenstein illusion 460x460
Fraser spiral 498x500	gradient optical illusion 600x355	grey square optical illusion 540x418	isometric iIllusion 119x159
Jastrow illusion 441x277	Mach band illusion 294x293	Necker cube illusion 381x322	penrose stairs 300x235
Penrose triangle 287x248	relative size illusion 600x369
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WPClipart: clip art and photos optimized for use with word processors and tweaked to render well on common ink jet printers. Images are all in the Public Domain and may be used for commercial as well as personal projects, links are appreciated but not necessary. I ask that folks don't copy the collection to use as a competing image gallery online. See the Legal page for more information and the list of image sources. All images have been edited by me (and some created) with the GIMP on Absolute Linux. Additional resources for the GIMP which include brushes, scripts and tutorials are available at gimphelp.org