He has suggested a steel frame and a stone outer shell, leaving enough space for stairways, lifts and service ducts leading to the space in the pediment above, and a basement - possibly a nightclub - linking the arch with the existing stone lodges on either side.

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This means a body-on-frame type of construction in which the shell is bolted onto to a separate chassis.

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Picture Frame Innovations, for example, is a shell company armed with a patent that had once been held by IV, and though it is unclear if IV retained a stake in it, the shell has sued Eastman Kodak and Hewlett-Packard for infringement.

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Whereas the original prototype had a thin, flimsy shell, the Virta 2's gone downright rugged, ditching the iPhone chrome for a more durable gunmetal frame, and there's a full compliment of sensors (compass, accelerometer, ambient light and proximity) alongside quad-band radios, WiFi, Bluetooth and a pair of cameras for your video chat testing needs.

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