Answer:
What can run but canβt walk?
I move without wings, Between silken string, I leave as you find, My substance behind.
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.
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
I am a box that holds keys without locks, yet they can unlock your soul.
I am used for light yet I am solid. Without me you would feel enclosed. I hate being touched especially with a lot of force. I like to be in buildings.