For children? The M-X3 costs 859 US dollars at the Grand Illusion Shop. However you can make one for 10 dollars. The Pseudoscope was not developed for kids. It was developed to show how the brain percieves the world.
Removing verbatim copying
User:Chriszuma's major update to the Pseudoscope stub is completely copied from a copyrighted source. Perhaps it was intended to use the text as a basis for original work, but a verbatim copy is not okay, even if you cite your source. Just letting you all know why I am erasing this material. I've left a collegial note for Chriszuma. Cheers, Caltrop 18:02, 3 July 2007 (UTC)