Optical Illusions Etc...: Raised or Indented?

Description Presented here is a vast gallery of many different forms of Optical Illusions. Whether these optical illusions are conveyed through fractals, photographs, architecture, art, or old fashioned pen and ink, they are bound to remind you that "seeing is not believing."

Caution!!!! Some of the optical illusions on this blog may cause dizziness or possibly epileptic seizures. The latter happens when the brain can't handle the conflicting information from your two eyes. If you start feeling unwell when using this website, immediately cover one eye with your hand and then leave the page. Do not close your eyes because that can make the attack worse.

Sunday

Raised or Indented?

I love this visual oddity. We've seen this with craters on the moon and foot prints in the sand. The photographer has this to say about the photos.

"This is two copies of the exact same photo, rotated 180 degrees from each other.

Are the letters on the marker raised or imprinted?

Is the marker itself slightly concave or slightly convex? "

What do you think?

Up or down?
Flickr Artist: mag3737
Tags: photos, optical_illusions, illusions, art

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