Something a little different - especially if you need to pass some time. A couple of online optical illusions sites.
One from Akiyoshi Kitaoka, (Professor, Department of Psychology, Ritsumeikan University, Kyoto, Japan). Check out Brain activity on this page.
Some more by Michael Bach. Professor in the ophthalmology department at the University of Freiburg in Germany
These were found here.
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No, I do not know how to do this. this blog does not appear to have any followers.