The word "开门" is formed through the direct, logical combination of two pictographic characters: "开", which originally depicted two hands opening a bolt or latch, meaning "to open", and "门", a pictogram of a double-door, meaning "door". Their union creates a transparent, verb-object concept where the action of the first character is applied to the object of the second, visually and semantically representing the fundamental action of "opening a door". This concrete meaning naturally extends to metaphorical uses like opening a business or commencing an event, but at its core, the formation is a straightforward ideographic assembly of an action and its immediate target.