Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
A house of wood in a hidden place. Built without nails or glue. High above the earthen ground It holds pale gems of blue.
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
Some live in me, some live on. And some shave me to stride upon. I rarely leave my native land. Until my death I always stand. High and low I may be found. Both above and below ground.
I have two hands but cannot clap
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.