About this experiment & keyboard controls
Arrange mirrors and steer a beam through the room. Build a periscope, trap reflections, or open an unexpected path.
Tab to the canvas. Arrow keys move the crosshair; hold Shift for a larger step and modifier actions such as cutting. Enter toggles contact to draw or drag, Escape releases it. Space pauses or resumes. Controls also work with touch.
Prototype models are designed for exploration. They are not calibrated scientific instruments. Save image downloads the current field as a PNG. Your session resets when you reload.