Optical illusions using geometric patterns and moire overlays (i.e. a transparent sheet striped with black bars) are nothing new; you can bop over to Amazon and find books detailing the process here and here. Now YouTube user "BrussPup" has brought the technique into the 21st Century with the help of his iPad, as demonstrated in the above video. Think of it as the low-tech version of Holo-Paint's 3D text holograms.
Todo Checklist iSmashPhone Hands-On (Review)
4 iOS Devices That Took a Beating and Kept on Ticking
iSmashPhone Hands-On: iPhone-Controlled Stunt Car Racer
3 Leaked iPhone Parts That Have Made Their Way to the Internet
Vintage Pin-Up Smartphone Ads Warn of the Dangers of Roaming Charges
How to Have Your iPhone 4 and iPhone 4S In Any Color You Want
Apple vs Proview: The Latest Happenings
3 iPhone and iPad Rumors For Your Amusement
FIFA SOCCER 12 by EA SPORTS (Sale iPhone Game)
PhotoToaster (Sale Universal App)
New iOS 5.1 Features and How to Update
How to Improve Your Cooking Skills
Now Available: Facebook Pages Manager
Fascinating Video Explaining How an Accelerometer Works
Dungeon Crawlers (Free Universal Game) Todo Checklist iSmashPhone Hands-On (Review)
Accessories & Apps: Beta Testers Wanted
iOS Firmware/IPSW Download Guide
Legacy iTunes Download Archive
App Store Top Charts
iPhone and Android Resale Value Charts
USA iPhone Carrier Plans Compared
Complete iPhone Jailbreaking Guide 
Complete iPhone Specification Matrix
this is a perfect example of where technology just got overused. just need another fuggin’ piece of paper to pull this off. no need for an $800 iPad. yeesh.
Despite the fact that this does not require an iPad, these are really really cool.
ya really this is very fantastic but the question is that….how can we spend this much on an i pad which has this function