One of the works is a giant typewriter eraser. When my friend took her niece (I'm guessing around ten years old at the time) to visit the park, the girl asked, "What's that?"
— Oh, that's a typewriter eraser. Back before Wite-Out or eraser ribbons, this was how you corrected mistakes. This end is the eraser, and you use that end to brush the crumbs off.
The next question was unexpected, but in retrospect, inevitable.