Only took a day for someone to notice that. <IMG SRC="http://www.keenspace.com/forums/smile.gif"> Not modern really, but they do have several advances and you'll see why soon. The stones do indeed glow, but have to be replaced every now and then when they dim. Outside the den, they have a bunch of them that pretty much act as natural light bulbs. They absorb the sunlight and refract it inside for a few days before needing to be out in the sun again. They generate zero heat, just light. As for the switch, it's not a switch in a conventional electric fashion, it merely pulls a shade over the light since constant light can be annoying. When the light's needed it can be pushed up into a small chipped away section of the wall. I spent a long time considering what kind of advancements Shivae would have in conjunction with those they trade with and since they don't have opposable thumbs they have to manipulate most things with their mouths if it's small. You'll also notice there seem to be blankets on a hardened nest. Clearly, those are NOT created by the Shivae.