Is "The fish is on the bowl" correct?

Why

Kabir seems to be treating "on" as a general, all-purpose location word, which would be simpler if it were true — but English location words are actually quite specific about the SHAPE of the relationship being described. "On" describes something resting on top of a surface, touching it from outside — a book on a table, a picture on a wall. "In" describes something enclosed or contained within a space that surrounds it — water in a glass, a fish in a bowl, clothes in a cupboard. A fish inside a bowl is surrounded by the bowl's curved sides and the water, not perched on any outer surface, so "in" is the word that actually matches what's happening. Test: picture a fly sitting ON the rim of the bowl (touching an outer surface) versus a fish swimming IN the bowl (enclosed inside it) — both are true about the same bowl at once, and each needs its own preposition because the physical relationship is genuinely different. His mother is right: something enclosed inside a space takes "in", while something resting on an outer surface takes "on".