> you can phase shift/delay signals however you wish and it should not add distortion. Digital audio sampling rates and resolution are far higher than the limi

> you can phase shift/delay signals however you wish and it should not add distortion. Digital audio sampling rates and resolution are far higher than the limits of perception, so there's sufficient resolution to shift by eg. half a wavelength for noise cancelling or by fractions of a wavelength for beamforming (at least, if you use the highest sample rates and resolution supported by your equipment, rather than the CD audio standard default settings). The spatial resolution of computer graphics does not yet have such comfortable headroom. In the best cases, they've caught up to normal human visual acuity but usually not vernier acuity. Once displays outpace eyeballs to the same extent that soundcards outpace ears, it will be possible to shift an image by 1mm and have it remain as sharp-looking as the original—because a sharp edge smeared across several pixels will still be sharp enough to look "perfectly sharp" to a human.