Teller, of Penn & Teller fame, explains some of the psychology used for illusions. Really interesting to see behind the curtain and learn how magic relates to real life behaviour.

I found myself wondering about how this behaviour can happen when I’m designing interactive processes like websites or apps. Could this repetition be used or abused to get the user to do what we want?  At the moment we can fail to think enough about it and that leads to bad user experience.