If you have an anaglyph glasses (those with red/blue filters), put it on and look on the bottom stereo photograph. Then smoothly focus on waves until you see hidden 3D image as well.

Actually I wanted to create a training stereogram for people who can't see them. Using Anaglyph Glasses they can achieve needed parallel sight and finally see hidden relief. After you can take the glasses off without focusing and the hidden image will stay.

BTW, you can get anaglyph 3D glasses in the USA for free at [link] just send them Self Addressed Stamped Envelope and ask for Red/Cyan anaglyph glasses. There are many nice 3D photographs in the Internet you can see if you get the glasses, for instance here, at Flickr.com - [link]

P.S. The Stereo Photograph is taken at North Shore, Hawaii, Free aircraft model by Mark McGill - [link]