The front door is the first signal that you get when you go to a full-service restaurant as to whether this is going to be a transaction—i.e., 'Give me your name, and I'll give you a table. Give me your order, and I'll give you food. Pay your bill, and we're done.' It could either be that, or it could be recognition, eye contact, a smile, a sense that I'm happy to see you, a sense that I do see you, a sense that you matter.