Archie: I made a pyramid!
Carter: (still building) Actually, Archie, it’s a triangular prism.
Me: (Inhaling to urge Carter to respect Archie’s joy of learning by not constantly correcting him, pausing because I can’t figure out how to convey my message without constantly correcting Carter)
Archie: (just as gleeful as his first exclamation) I made a triangular prism!