Information on a tricky picture which is a skull from afar or lady brushing hair infront of a dresser if near?

Question

I saw this drawing long time ago, it is a black and white print, I don't know it was done by whom. Anyone tell me where I can see or get this drawing??

Answer 1

Found it!
All is Vanity by Charles Allan Gilbert is the original

http://en.wikipedia.org/wiki/Charles_Allan_Gilbert

has been imitated and redone since

Answer 2

I think this is the work you're looking for;

Georges de La Tour. Repenting Magdalene, also called Magdalene in a Flickering Light. c. 1635-37. Oil on canvas. Los Angeles County Museum of Art

Here's a link so you can have a look.
http://www.abcgallery.com/L/latour/latour42.html

Answer 3

I know the one you are referring to. It's an optical illusion.