A chirality teaching tool includes a central sphere representing a chiral carbon atom, and four projections representing substituents bound to the chiral carbon atom. The central sphere includes two hemispheres rotatable relative to each other. Each of the four projections forms an angle of about 100 to about 120 degrees with each other projection on the same hemisphere, and each projection is capable of forming an angle of about 100 to about 120 degrees with each of the two projections on the other hemisphere. A message indicating the type of chirality (e.g., “R” or “S”) is visible from outside the central sphere and displayed on or below the outer surface of the central sphere. The message changes when relative locations of two of the four projections are exchanged by the rotation of the two hemispheres 180 degrees relative to each other.
