This was a Valentine eCard for my wife.
Here we create an illusion that the image in the lens is an altered view of the image beyond the lens. In reality these are two separate images.
Mouse-drag the lens to search for the hidden clue.
The idea for this came out of some initial experiments with moving alpha-channel masks. I especially love this effect, because the apparent complexity is created entirely from @ four lines of ActionScript.
I plan to add a zoom control, and Xray features.