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

We do say close and opened as well.

“close the door” because it’s a thing that has not happened yet.

“The door was opened” because it is a thing that happened in the past.

So we use open, opened, close and closed.