Drag to turn; right-drag, shift-drag or move two fingers to slide the view; scroll or pinch to zoom in on whatever is under the pointer; double-click a part to turn round it, and Reset view to go back. Pick a disc above. Each is its cut file’s own outline at 3mm, stood on edge with the cord loop through its two centre holes and out to a hand at each side. Wind it up, pull the hands apart, and the cord unwinding spins the disc about it: tick Spin it to see which way.