1. A method, comprising: electronically determining a physical property of a physical object, wherein the physical object is allowed to move above a display and within a playfield of a pinball machine, wherein the physical object includes at least one of: a pinball, a flipper, a slingshot, a kicker, a bumper, a target, a plunger, a hole, a saucer, a spinner, a gate, a switch, a stopper, a ramp, or a magnet, wherein electronically determining the physical property includes using a first electromagnetic transducer array and a second electromagnetic transducer array, both of the first electromagnetic transducer array and the second electromagnetic transducer array being disposed above a surface of the playfield, the first electromagnetic transducer array being on an opposite side of the display from the second electromagnetic transducer array, the first electromagnetic transducer array comprising first electromagnetic radiation transmitters, the second electromagnetic transducer array comprising first electromagnetic radiation detectors, and wherein the first electromagnetic radiation transmitters are in at least partial direct lines-of-sight with respective one or more of the first electromagnetic radiation detectors; and rendering a virtual object on the display in response to an evaluation of the physical property.