Build a real optical experiment one piece at a time. Each level adds the next component that a physicist installs when setting up the Mach–Zehnder interferometer.

Any inventory piece will snap into any empty slot — so if the beam scatters when you press TEST, you picked the wrong optic for that spot. Swap it and try again.

Finish all eight steps — including the source polarizer, both path markers, and the eraser — to see the signature bright/dim two-detector pattern of the real THOR kit.