The article describes a proof-of-concept project called 'Project Sistine' that turns a MacBook into a touchscreen using only $1 of hardware and computer vision. The system uses a small mirror positioned in front of the MacBook's built-in webcam to detect fingers hovering over or touching the screen. The video feed is then translated into touch events using computer vision techniques. The project demonstrates a low-cost and practical way to add touchscreen functionality to a laptop.