Why do we say “open” and “closed”? Why is one in present tense and the other in past tense?

Question

Edit: to clarify, I mean when shops have a sign that says “open” versus “closed”. Why is it not “opened/closed” or “open/close”?

In: Other

Answer 1

Because when open, it’s live and happening. Closed is past tense because you’re referring to the fact you were open in the past. I’d you weren’t previously open, there’d be nothing to close.