The Chinese character for fire, 火,
is so written because it resembles the shape of a flame itself. The
character for eye, 目, resembles the shape of an eye. The character for door, 门, resembles the shape of a door, complete with a knocker on top. So on and so forth.
If I were to write you, you would be 关, meaning: closed. Meaning: cut, barrier. Resembling the shape of a gate. Meaning: I will never knock on your door again.