The Room

Take the lesson off the glass.

The same world your tutor works in, shown the way a room can carry it — across projected walls, in a headset, in the space you are actually standing in, or floating in a small pyramid on the desk. Each way tells you plainly whether this device can do it. Nothing here pretends a capability the hardware doesn't have.

Hologram is the Pepper's-ghost pyramid layout — a real optical trick you make with a cheap acrylic pyramid. It is not free-space holography, which nobody can ship yet. AR and VR / MR light up only on devices that report WebXR support; on a plain laptop they are greyed out, honestly.