Please note: Beads are Red and White, not Red and Green.
Two clear plastic cups are displayed. Inside one are red beads. The other contains white beads. The beads are then all poured into one cup and mixed together. Then, the cups are both placed behind the performers back for only a few seconds. When the cups are brought back to the front all of the beads are seen to be back in their original place!
This is truly an incredible effect, and very easy to do.