Answer: PINHOLE

Possible questions:


Tiny opening we know 2 Answers
Small aperture we know 3 Answers
Tiny aperture we know 1 Answer
Tiny puncture we know 1 Answer
It's hard to see through we know 1 Answer
It admits very little light we know 1 Answer
Flask flaw we know 1 Answer
Film flaw we know 1 Answer
Camera obscura feature we know 1 Answer
Balloon flaw we know 1 Answer
A poster may have one we know 1 Answer

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