Lizzy blinked at him. "You're watching the... ceiling," she clarified. "You mean of the thing you're sitting on? That sounds boring." She was already looking for a window ledge or a hole in the wall or the ladder that he used to climb up there so that she could join him. She wanted to be up high too. She didn't really understand that he was talking about the sky. It wasn't a ceiling to her.
"I'm being normal," she said irritably when he asked her what she was doing down there. "Most people don't climb up to just sit around on top of buildings and look at them. How did you get up there anyway?"
She'd tried a few different things, but she didn't see any way that she could use to get up there, and certainly not something useful like a ladder or anything, so she was a bit stumped.