Your poll is somewhat broken (last option missing). Note that ability to rotate in the mind is very differently expressed. Some people do it effortlessly, some even with multiple elements (Tesla was said to be able to animate whole machines in his mind). Therefore I'd recommend to provide a scaled or indexical poll ("not at all", "partial/limited", "single element single rotation", "single element, multiple motions/changes", "multiple elements interacting (gears)", "whole machines"). As only 4 people (me included) voted I recommend to repost the poll and extend it.