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The signs on the entry to the Dark Room.
The Dark Room was quite impressively done; my crack team of engineers, computer scientists, and a teacher were able to turn my little room completely dark. Even during the day, with the bedroom door open, extremely little dark leaks out.
The windows were covered with black poster board, with additional light blocking so that the windows could be opened (it got really hot in there) all allow air to circulate, but not light.
The doorway was covered with two layers of black velvet (about 2 feet apart) to allow people to enter and exit without lightleak.