One of the most important changes Fukuichi made was removing stifling layers of bureaucracy from the design process so that bold ideas could flourish.

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Among the most striking of the architectural drawings on display is the study for the plan of San Giovanni dei Fiorentini (1559-60), a sheet in which one can read the layers of overdrawing and erasure through which Michelangelo refined his design, transforming the sheet into a palimpsest of rejected ideas.

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Any change in supplier or design would be "a pretty significant challenge, " the person said, requiring layers of modification from hardware to controlling software to adjust for a new battery.

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Though still classic in design (some have two and three heads to make veins and layers), the length and type of hair for the brushes have been changed to accommodate water-based paint, which the industry has embraced in place of oil-based paint.

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