Leop made sure to keep his face from showing any sort of bewilderment at the idea of handmaidens- that was really a thing? holy cats! -but his eyebrows sure started raising as she described the mechanisms of the moving shelf, then furrowed in thought as his mind started running over how to make that work with the resources they had there at Hateno.
"The wheels and track, were they made of wood?" he asked. He had a feeling the answer was no, a wooden track and wheels wouldn't make the movement of the shelf as it was pushed in and out very smooth.