Every screen in the product, drawn before a single table exists. Nothing here talks to a server and nothing is real — no account you make is kept, no order you place reaches anyone. It is here so the flows can be argued about while they are still cheap to change.
The two that show what the product actually is.
What a member of staff does all evening.
Drawn first, because everything above inherits from them.
The tokens and components every screen above is built from.
Try it in daylight. Every screen carries a light and a dark ground and the switch is in the top bar. Dark is the default because staff look up from these screens onto a floor lit by monitors — but the light one is not an afterthought, and it is worth a look before anyone decides.