OS X Login screen concept

Hi dribbblers!
Just want to share with you another login concept.
Description:
User can predifine some graphical key to login or switch to normal login via password. Graphical key includes many dots but only one way and one order will be the right! So there a lot of combinations and only you'll know the right one.
If somebody near you — just switch to normal login mode.
Hope you'll like it