You could get a phantascopic system planted directly on your retinas, just 
as Bud's sound system lived on his eardrums. You could even get 
telæsthetics patched into your spinal column at various key vertebrae. 
But this was said to have its drawbacks: some concerns about long-term nerve 
damage, plus it was rumored that hackers for big media companies had figured 
out a way to get through the defenses that were built into such systems, and 
run junk advertisements in your peripheral vision (or even spang in the fucking 
middle) all the time—even when your eyes were closed. Bud knew a guy 
like that who'd somehow gotten infected with a meme that ran advertisements for 
roach motels, in Hindi, superimposed on the bottom right-hand corner of his 
visual field, twenty-four hours a day, until the guy whacked himself.