Let me show you an example:
Of course, we all see a zebra, that is not the illusion. The question is what do you perceive from a zebra? Apparently most white people see a white animal with black stripes, whihttp://www2.blogger.com/img/gl.link.gifle most black africans see a black animal with white stripes.
I guess the next picture (from the University of Bergamo) is cultural free?
By the way, in search of information about the use of post-its for user testing I found a link to an article about its use for brainstorming, but also a link to a "proper zebra-crossing":
http://hiddenchemistry.com/proper-zebra-crossings/
I am not so very sure that foregoing example is a real cultural illusion, but the next is. Look at these stairs:
Again, the illusion is not whether these are stairs or not, but how do you perceive them. Are they going up? Or are they going down?
Apparently most Europeans and Americans perceive these stairs as 'going up', while people from countries where the direction for reading is from right to left look upon these stairs as going down.
It makes me wonder if the same goes for the next stairs:
Are these stairs going up or going down? Based upon what?
Let me finish with the most interesting stairs, several illusions appear together here:
If you want to know more about it, read the accompanying article: http://www.quantonics.com/Stairs_As_Perceived_by_Our_Quantum_Stages.html
