My understanding is that a PLINTH block is used at the base (floor)
for base molding and the bottom of door casing. A PINCH block
is used for the crown (ceiling). I thought I was wrong, once, but
it turns out I was mistaken. ;-)
Actually, "googling" on "pinch block" shows examples of use at
the ceiling, and on "plinth block" you see examples of use at the
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