Mary's a little distracted by shiny things, so she doesn't notice till they get to the counter that he's all hunched up like that. She touches his arm.

"You're not claustrophobic are you? Sorry, I didn't realise how little this place is."

It's about the size of someone's front-room, probably because once that's what it was, and a little bit of everything is shoved in with no real regard for whether it fits or was ever asked for more than once.