I can go through glass without breaking it. What am I?

Common Wrong Answers
“Air”
Air cannot physically pass through glass; it is the space between the glass panes that allows air to exist, but air itself does not go through the glass.
“Water”
Water cannot pass through solid glass without breaking it; it would need to be in a liquid form and contained rather than passing through the glass.
“Sound”
While sound can travel through glass, it does not 'go through' it in the same way light does, since sound requires a medium to travel and doesn't have a direct interaction with glass like light does.
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