Its something like a ...hm.. Magic Library with some Magic Books and other Artefacts. The should be useable and when they are back on the place where they belong (or a Magician comes along with a hidden coil) they should light up. I dont have much space in the Books and Artefacts.
Yeah you can also buy them on Aliexpress, but I will need sometimes some modifications and so its better to diy. (bigger/smaller coils... Leds to the side ... and so on)