I make everything double
but I am only one.
What am I?

Q: I make everything double but I am only one. What am I?

A mirror.. One sheet of silvered glass, infinite copies. Stand a child in front of one for the first time — they’ll spend an hour debating which is real.

Question

Accepted Answer

A mirror. — One sheet of silvered glass, infinite copies. Stand a child in front of one for the first time — they’ll spend an hour debating which is real.