As someone who once represented the water-line of a glass tipped sideways *parallel* to the glass bottom - you know, the old Piaget experiment? - I'm tainted goods.
I draw (some) consolation from the fact that my mother did *exactly* the same thing.
I console my self further with the trope that we were probably going for *aesthetics* t (i.e.symmetry) rather than reality.
The cruel truth that I am (still!) concrete-operational is too much too bear.....
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