Design Flaw that the Professionals on here may spot.

it's suitable for extremely thin people who are willing to approach the door from a straight line to the centre.
 
Its obvious that you would put curtains or blinds up on the windows.
 
Its obvious that you would put curtains or blinds up on the windows.

And if you want to view who is at the door without them seeing you, you just lift the blind and look through the viewer?
 
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