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- Mon Dec 10, 2012 11:03 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1145: "Sky Color"
- Replies: 211
- Views: 70992
Actually, it is quite sad to see that so far apparantly hardly anyone has even understood the mirror reversal problem. It's quite obvious that a mirror placed at y=0 performs the operation y ↦ -y . This is equivalent to a 180 degree rotation about the z axis (up and down), except for the fact that s...