This is yet another non investment banking related post I know (really, I will post some more. Just as soon as I get time away from my investment banking related job….)
I’m always interested in how we work and in particular our brains. Another example of our brains trying to do something clever with the information they receive is this optical illusion :- http://www.johnsadowski.com/big_spanish_castle.php
I’m assuming its related to the way our neurons effectively ignore a continuous input after a while (that being why the magic is broken as you move your eyes). Though I have no idea how the overlaying of colours works.
Anyone (who am I kidding, hi Pete) who reads this please feel free to shed some light on it.
mnemonic flotsam 
Wow, that is good. I wouldn’t like to attempt to explain it though.