Shoe (cards) must be dealt from a shoe (Scarne's invention). While no such ruling was ever passed, most Nevada casinos now deal from a multi-deck shoe. As gaming advisor to the Havana Hilton, Scarne also introduced the shoe to Puerto Rico and Cuba. The device is so named because the earliest versions of it resembled a woman's high-heel shoe, and were often painted red or black in color. Dealing shoes come in many colors and sizes, depending on the number of decks they are capable of holding (2, 4, 6, or 8 decks). When the cards are placed in the shoe, the
Optical variable device and the angle the OVD is viewed at. Holograms are a type of OVD. Optical variable device An optical variable device or optically variable device (OVD) is an iridescent image that exhibits various optical effects such as movement or color changes. OVDs cannot be photocopied or scanned, nor can they be accurately replicated or reproduced. The OVD is often used as a security device and anti-counterfeiting measure on money, credit cards and government-issued identification cards. OVDs can be created through a combination of printing and embossing. OVDs are based on diffractive optical structures. This gives cards the appearance of having