Can someone explain how this optical illusion works?

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Hot girl at work just asked me if I wanted to get drinks after work while I was doing this.
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You're on the outside of a window looking in
The blinds are down (vertical)

you can KINDA see whats going on but you move side to side to keep blinds from obstructing vision

This is the same thing - but on a smaller scale so obviously your side to side movements will be limited to slight head shaking
Black bars are the blinds on a window
 
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