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After Illusions Come the Impossible

Last week's focus was a contest involving the creation of visual illusions, many of which create an aura of the mathematically impossible. Thus, it is only fitting to continue on this theme with a recommendation of a neat web site that focuses on impossible figures, which are closely connected to geometrical thinking.

The Impossible World is run by Vlad Alexeev as a hobby, and offers both an English and a Russian version. Without question, it is a great resource for mathematics teachers and students.

Consider these options:

What more could a mathematics teacher or student want (or have time for)...as the Impossible World seems to cover the impossible!