Tom's Journey

The other day, I was proofreading for SMS on his dissertation, and
thought the usages of 'optical illusion' was not used correctly, so I
searched on Google about "optical illusion', and found href='http://www.michaelbach.de/ot/index.html'>Michael Bach's
collection of 46 Optical Illusions, pretty cool!

# posted by Dongming Lu @ 5:37 PM