The background is actually static. Move your eyes around the page and the wheels will appear to rotate slightly... This 'anomalous motion' image was created by Gianni A. Sarcone (©2002). This isn't a ©-free image, if you use it don't forget to credit us... A link back to our optical illusion site (www.archimedes-lab.org/index_optical.html) would be also greatly appreciated!

How to download the background gif image?

PC
Right click on the small image above and then save it to your local file using the "Save Image As..." option.
MAC
Simply drag the small image to your desktop or click and hold, then save it to your folder using the "Save As..." option.

More background patterns here.

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Archimedes' Laboratory™
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