Four glasses, an apparently identical water level, but different objects immersed in each. This little visual challenge that is a hit at the moment hides a scientific trick that many miss at first glance. And depending on the glass you choose, it may say a little more about your personality than you think!
A seemingly easy enigma... who hides his game well
Here is the staging: four glasses named A, B, C and D. Each one seems to contain exactly the same volume of water. Nothing alarming a priori. Except that on closer inspection, each glass contains an object immersed in it: a paper clip, a ball, an eraser and a watch.
The question that turns everything upside down: which of the four glasses really contains the largest volume of water?
Most people immediately rely on the visible level of fluid and respond instinctively. It is precisely at this moment that the trap closes.
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