These optical illusions represent a cross-section of different themes designed to fool the mind. The pictures are static, except for the spinner, which is animated in form.
All spheres are same color:
Young/Old Woman Illusion
Square & Boxes
Stare at center dots for 30 seconds and see afterimage.
Same image, but tilted sideways
In which direction is the "spinner" spinning?
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Fata Morgana on a Yacht Charter: Optical Illusions at Sea?
On Yacht Sailing - http://library.si.edu/digital-library/book/onyachtsailings00dayt
The American Yacht List - http://onlinebooks.library.upenn.edu/webbin/serial?id=amyachtlist
Yacht Charter - http://www.hmy.com/Yacht-Charter/