"Don't square a squared deck!" - David Williamson #magic

David Williamson shares a valuable tip in card magic, advising against squaring a deck that's already squared. This tutorial or theory piece likely focuses on enhancing handling techniques to ensure efficiency and naturalness in card control. Williamson, renowned for his meticulous approach to sleight of hand, probably emphasizes the importance of minimizing unnecessary movements to avoid telegraphing setups or disrupting performance rhythm. The video is expected to blend practical advice with Williamson's characteristic humor, reminding magicians to evaluate their handling habits for any unintentional tells.