Symbolizer by Chris Bolter - Trick

A series of traditional ESP cards are introduced to a subject. For this test only two symbols are necessary - the square and the circle.
An experiment of psychic ability will begin momentarily. The purpose is to determine whether or not someone can psychically intuit whether the cards bear a square or a circle.Ten cards - (five circles and five squares) are shuffled together and held up one at a time.

To start, one card is held up and the subject must divine which shape it holds. This card is then openly shown to the subject, allowing him to see how strong or poor his psychic intuition is.The experiment is continued with the second card, allowing the subject to again see his psychic progress. Now the real test begins, the remaining eight cards are held up and quickly placed into whichever pile the subject believes they belong.

To conclude the experiment the cards are turned over and fanned out.

Showing a perfect separation of squares and circles.