Pink Fairy Jar

A jar starts with a live fairy, so the work is netting one of the drifting critters before it wanders off. Bottling it is reversible: throw the jar into shimmer and you get the fairy back as something you can carry and release.

It gives a soft glow that suits a dark room and keeps working underwater, but it does not satisfy the light requirement for NPC housing. A room lit only by fairy jars will not pass, which is the one difference worth remembering against the jellyfish version. Nothing about it can be switched: no wire input, no off state. Treat it as decoration that happens to glow rather than as lighting you plan a build around. The three colors are separate items, so a shelf of all of them takes three separate catches.