What hides this stereogram?
[1817] What hides this stereogram? - Stereogram - 3D Image - #brainteasers #stereogram #3Dimage
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What hides this stereogram?

Stereogram - 3D Image
#brainteasers #stereogram #3Dimage
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During a visit to the mental a...

During a visit to the mental asylum, a visitor asked the Director how do you determine whether or not a patient should be institutionalised.
Well, said the Director, we fill up a bathtub, then we offer a teaspoon, a teacup and a bucket to the patient and ask him or her to empty the bathtub.
Oh, I understand, said the visitor.
A normal person would use the bucket because it's bigger than the spoon or the teacup.
No said the Director, A normal person would pull the plug out.
Do you want a bed near the window?
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Camera obscura

In 1544, a solar eclipse was viewed at Louvain, which was later depicted in the first published book illustration of the camera obscura in use. Dutch mathematician and astronomer Reinerus Gemma-Frisius viewed a solar eclipse using a hole in one wall of a pavillion to project the sun's image upside down onto the opposite wall. He published the first illustrationof a camera obscura, depicting his method of observation of the eclipse in De Radio Astronomica et Geometrica (1545). Several astronomers made use of such a device in the early part of the 16th century. Both Johannes Kepler and Christopher Scheiner used a camera obscura to study the activity of sunspots. The technique was known to Aristotle (Problems, ca 330 BC).
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