Best Optical Illusion Ever

"Reading the title, and understanding it came directly from me, I suppose adds some weight to the actual Leopard Illusion you see below. It’s hard for me to explain how this illusion came to be, without revealing the actual solution, thus ruining the surprise-effect for you. There is much relevant info and background for it, but for now I’ll retain myself just on revealing the author behind it – the magnificent Craig Tracy. First thing you’ll notice is that it’s not some photo of an actual animal, rather a realistically painted picture. But you’re still far from seeing the illusion. Only tip I can give you, is that leopard’s eyes were painted on a concrete floor. I suggest you examine the picture more closely before seeing this final hint. I’ll monitor the forthcoming ratings, and am eager to see if you agree with me that this must be one of the best optical illusions ever created!" Best Optical Illusion Ever