Click the green flag. REQUIRES VIDEO CAMERA Turbo mode may work better. "Allow video" in the Flash dialog that comes up. Move yourself in front of the camera and watch the screen. Press space bar to take a snapshot.
Video movement is detected by many "camera" sprites & clones and displayed in a smaller "TV" using up to 456 "pixel" sprites, varying their shading (using brightness effect). previous projects were less successful: video experiment 001 https://scratch.mit.edu/projects/14829038/ video experiment 003 https://scratch.mit.edu/projects/15102720/