Ethan’s Christmas stocking contained a glow worm, one of those squishy, stretchy, nearly unbreakable critters. This one had a ball inside that lit up in various colors when it sensed an impact. It had a hole on the top, I think for hanging on the rack in the store.
Ethan had a different idea. He removed the knob from the dining room dimmer switch (how he knew it was removable, I don’t know), hung up the glow worm, and replaced the knob. Now when you want just a bit of light, just knock the critter.