At 01:52 PM 15/09/98 -0400, KA4HJH wrote: >This certainly seems to be a perennial favorite. .....this is true.... there is somewhere an animation of the "endless staircase" illusion with a ball bouncing "down" it endlessly as the Shepard tone drones away....they used to show it in psych classes in the 60's....hmmmmmmm. paul perry melbounrne australia