The world around him would turn very sharp and vivid.

. . . Zach at first didn’t realize that he was having another type of seizure also. They were less frequent, but they too came unbidden. And they were pleasant. Very pleasant. He might have had them as a kid, but he can best remember the ones that happened during his college years. The world around him would turn sharp and vivid, as if until then he had been seeing everything on a flat screen and suddenly someone had taken the screen away to expose a 3-D world. He noticed details in ways that he wouldn’t otherwise.

  --  Anil Ananthaswamy, The Man Who Wasn’t There, p. 227.