This is an easy 10 minute project to make a cool 3D illusion. visit Hack-a-Day site to see what it's all about.
Step 1
Download this PDF File: PDF FILE (size 156K) and Print it out (2 pages).
Step 2
There are two logos, one is slightly smaller than the other. Take the smaller logo and carefully cut out the skull, using a small scissors or X-acto knife. Discard that skull. Set that page aside.
Step 3
Take the larger logo and carefully cut out that skull. You'll use that skull, but not the rest of it.
Step 4
Cut four slits as shown ... almost to the center of the skull, but not quite.
Step 5
The idea is to make the skull concave, so slide the paper slightly and tape on the back to hold it. You'll be making what looks like a bowl.
This is what it should look like.
Step 6
Tape the concave skull into the smaller logo that you cut out, so it's flush with the front.
Hang it in the room, at a distance. Have people close or cover one eye and walk around the room. If they stare at the skull, it will appear to follow them.