That is a distinction lost on many I'm afraid. And here I thought all those hours reading primary sources, and stacks of books piled in the basement to hold up the Lego creations and Hot wheels tracks, were never going to be used properly again. ;-)
Ah, c'mon, you are supposed to use reinforced papertowel rolls for structural support! Thataway, your books can hold open stubborn doors or even out wobbly tables!