Von Karman Vortices

Image Source: Landsat 7

Description: As air flows over and around objects in its path, spiraling eddies, known as Von Karman vortices, may form. The vortices in this image were created when prevailing winds sweeping east across the northern Pacific Ocean encountered Alaska’s Aleutian Islands.

OK, so this isn't really an illusion, but it is a great image!

This is typical of the wonderful satellite images that are available on the USGS web site.  This one is located here:

http://edcw2ks15.cr.usgs.gov:8090/ImageGallery/SilverStream/Pages/pgImageDetail.html?ImageID=253

The rest of the Earth as Art images are located here:
http://edcw2ks15.cr.usgs.gov:8090/ImageGallery/SilverStream/Pages/pgImageDisplay.html?CollectionID=36

(There are versions that can be downloaded for free.)