These images are NOT my own work but a collection from the internet.
Some images have an answer, if you see a tiny question mark to the right of the image, if you are stuck, click it and the solution will appear.
There are some more amazing images shared by The Sun here , here , here. and here.
Also diyphotography here and is this a dog or clown (scroll down) and some classics and 21 incredible ones and The Phantom Queen.
Some YouTube videos: 3d printed illusion and 9 Mind Blowing Optical Illusions.
Some people believe the things you see in optical illusions reveal your inner truth.

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For more information on the implementation of Lightbox2, visit http://lokeshdhakar.com/projects/lightbox2/