re hallusion info sean murphy sean aries scs uiuc edu wrote has anyone seen hallusions you can buy a poster of them and it looks like a simple dot pattern when you first look at it but if you focus behind it you see a d picture i m looking for a program that generates these pictures there s a company in texas that makes them but i doubt if they re giving the program away any help would be appreciated there is a program included with the book virtual reality playhouse which will let you generate these pictures it s not a very powerful program but it does an acceptable job for experimentation purposes davidr rincon ema rockwell com
