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Hmmm, this is a funny one to think about…

Look. I’d say a door is actually much the same as a switch in this regard weirdly enough. Because a switch’s purpose isn’t to block electricity or to let it flow — otherwise you wouldn’t use a switch! You’d have either a gap or just a wire there.

No, a switch’s purpose is also to do both, just like a door. And a switch is considered ‘off’ when it is open as it doesn’t allow passage. So by the same logic a door must be considered ‘off’ when open! And ‘on’ when closed. I rest my case

This is causing a bit of a stir on Twitter but:

if we consider a door to be a kind of mechanical device, there must be an on state and an off state.

so.