If the situation demands it, the Nanobots form up into bigger machines.
This ability makes it possible to transform into any object and act like this. The roboter´s artifical intelligence enables them to act independently, while there is a higher computer system which supervises/observes their actions, gives orders and corrects possible false functions.
Principally the Nanobot has two states - the active state which lets him acting independently, and the passive state, which he assumes as soon as he forms collectivley up with additional units.
Top and Side View.
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FLUXION CONCEPT TRAILER (2003): http://vimeo.com/20373752