FILE No.197Unsolved
An art museum's exhibition room has infrared sensors. The infrared beams run at fine intervals from 60 cm to 2 meters above the floor. The beams were never interrupted.
Even so, a painting vanished from the exhibition room. In the dust on the floor was a single trail about 50 cm wide.
How did the culprit get through the exhibition room?
If you get stuck, open the hints one at a time, in order.
At what height above the floor are the beams?
What does the trail in the dust show?
Were the beams interrupted?
How did the culprit get through the exhibition room?
Choose the answer closest to the truth.
Crawled along the floor and passed under the infrared beams
The answer is "Crawled along the floor and passed under the infrared beams."
The infrared beams are set 60 cm or more above the floor, so staying close to the floor does not interrupt them. The single trail in the dust matches the width of someone crawling through.
The beams were never interrupted. If they had been turned off, a record of that would remain. Nothing is stated about the ceiling or walls.
Because you think the sensors guard the whole space.
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