The original activity’s name is “Card Flip Magic.” Square magnet sheets are used, with different colors on each side arranged in a grid structure. First, a magician arranges an even number of same colored sheets in rows and columns. An audience member turns over one of sheets while the magician looks away. The magician later guesses the sheet. The HPU version of this activity uses human pictograms instead of magnet sheets. Figure 1 is an example
Figure 1