" Do you think it's theirs, and they've gone away for Christmas? " said Hermione, peering through the window at a neat little kitchen with geraniums on the windowsill.
Harry leaned on the windowsill, looking out at the grounds, at the dark, rustling treetops of the Forbidden Forest, and the rippling sails of the Durmstrang ship.
The variety of plastic objects at risk is dizzying: early radios, avant-garde sculptures, celluloid animation sills from Disney films, the first artificial heart.
So, while they don't threaten people with pain, their bodies can cover window sills and streets and gas stations, creating stinky, slippery hazards for people passing by.
Not while you're building it, not when you put it on your shelf, not when it gets a little too much sunlight on your windowsill, and not—and I mean this—when you accidentally put it in the oven.