The idiom is "from person to person", Paco!
To make the example worse:
The butterfly seemed even more beautiful when looking through the microscope.
This is shading into the problem of multiply ambiguous structures such as:
We saw a man on a hill with a telescope. (Where were we? Where was the man? Who was on the hill? Who had the telescope? ... )
I read somewhere that there is a formula for determining the total number of interpretations when you know the number of prepositional phrases in such a structure.
Later. CJ