Remnants of a foreign creature perhaps?
This shell only allows a glowing glimpse of what it holds inside.
A large and marveling light cover with a space in the middle with room for Luxeon LED's or other power-saving lights.
Compatible with the 5.8 cm/2.25" and 5.5 cm/2" round Dioder LED lights from IKEA.
It hides the source from direct view resulting in a gentle glow emerging.