The Girl has a little marble and maze puzzle (maybe “ball bearing and maze” is a better description) that involves manipulating the plane of the puzzle so that the ball bearing roles through the maze. Nothing new: we all had one growing up. She’s developed an unorthodox method of solving it, though: she simply shakes it until the bearing gradually crawls to the center.
K decided it was time to teach her how to do it properly.
The results were amusing for both.