If you were using a Java-enabled browser, you would see Block World instead of this paragraph.

Disclaimer: This program was written by Dr. Robert F. Stärk and is available here with his permission. It was inspired by a similar and more sophisticated commercial program called Tarski's World published by CSLI at Stanford University. The Block World available from this page is not the product of CSLI. Dr. Stärk is not affiliated with CSLI.