Del Ray (Raymond Petrosky). Computer Card. Pittsburgh: Del Ray, 1990. A deck of ?computer cards? is placed atop a pack on the table; the screen at the center of the pack lights to indicate where the selected card lies with unfailing accuracy. In a custom wooden box (5 x 6 ?") with Del Ray?s lenticular business card framed in the lid. Manufactured by Del Ray for his friend Ken Klosterman and inscribed and signed by Del Ray to Klosterman under the base, and accompanied by a note in Del Ray?s hand to Klosterman. Del Ray constructed only a handful of effects as gifts for his close friends, including Flipper the Penguin, and an educated matchstick. The Computer Card trick was one such effect, and was regularly featured in his own performances.