matter, just as it is, carries out outlandishly complex chaotic quantum computations just by sitting around.

RUDY RUCKER ON fundamental limits to virtual reality.

..come on, if you want to smoothly transform a blade of grass into some nanomachines simulating a blade of grass, then why bother pulverizing the blade of grass at all? After all, any object at all can be viewed as a quantum computation! The blade of grass already is an assemblage of nanomachines emulating a blade of grass. To the extent that you can realize an accurate VR world, the exercise becomes pointless.