A self calibrating imaging display system and machine-readable storage for such systems are provided, which perform various steps. The modular units of each modular unit set has connecting surfaces each for connection to a corresponding connecting surface of at least one other identical modular unit or to a corresponding connecting surface of one of the modular units of another of the modular unit sets to construct a modular structure, such as a building structure, having a predetermined configuration. Alternatively, one or both of the food trays can be designed for cooling through temperature elements coupled thereto and the tray can be heated by overhead radiant heating elements for dual temperature capabilities.