The first thing you'll notice when you visit Tolia's website is that mousing over the words on the page surreptitiously reveal appearing and disappearing images, in essence the samples of each listed web toy.
If you've not yet had the opportunity of playing with a website toy, then I offer you this little guide to help you start playing with Tolia's fun website:
The image here in this post is snapped from the Lab - Illusion. After you click that link you'll notice when you move the page up and down with your mouse that there is a rectangle that floats over the other images. If you grab that gauze rectangle with your mouse and drag it up or down left or right, the other images appear to behave like little wiggle movies. This action is as a result of moire interference where pixels of the gauze cause an interruption of the light and shade with the intersecting image below, or adjacent to it - a kind of stop-motion animation.
To learn what little there is about Tolia and discover which other web toy experimenters he likes, then the Grateful Grapefruit blogger, managed a small interview, with him, here.