Doors, shelter from the wind and disasters, hide indoor privacy, and shield all external and internal characters. A house without a door is like saying please to all foreign information. The so-called foreign information includes: uninvited thieves, uninvited outsiders, uninvited villains, animals that have strayed into it, and all beings seeking asylum (that is, ghosts).
And will these people and things affect your daily life? I'm afraid it will hurt you. Therefore, the place with doors should be sealed tightly, so that everyone and everything you see can understand that there must be someone who can't get in.
Therefore, a board cannot represent the gate. Instead of making do with it, try to buy yourself a geometric door.