So there was a way to tell whether the charm worked or not. After professor Fuller was done demonstrating, Beverly turned back toward the wall she was working on. There was a slight fog after she'd cast, but not enough like Fuller's. More practice was needed.

She eyed the window next to it. The charm also worked on it. She'd try it on it after she was done here.

"Caelum Saepio!" The infinity symbol was traced just in front of the wall, and Beverly waited for this famous fog to make an appearance. She'd made sure to focus on certain patch of the wall. If she tried charming it from ceiling to floor as she had first planned, it wouldn't work out. She herself. She knew the outcome.

Fog! There it was. Beverly fist bumped the air as a square of fog traced the area she had cast on. Yes!