“The picture is in the wall.”
Prepositions Entry 264 / 1011 60-second read
On vs. In (location)
Different prepositions for different spatial relationships.
The comparisoni
“The picture is on the wall.”
The ruleii
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On = ON TOP of something.
Both relate to position but 'on' is for surface, 'in' is for enclosed space.
Memory aidiii
Remember it like this
On = ON TOP of something. In = INSIDE something.