|Isn’t this the best illusion you’ve ever seen? The squares marked A and B really are the same shade of grey. If you don’t believe me click here. Want the proof and the explanation?The science behind the illusion is explained in a paper entitled “Lightness Perception and Lightness Illusion” written by Edward H. Adelson of the Department of Brain and Cognitive Sciences at the Massachusetts Institute of Technology.
“Every light is a shade, compared to the higher lights, till you come to the sun; and every shade is a light, compared to the deeper shades, till you come to the night.” John Ruskin, 1879.
How does the ordinary non-technical PC user survive an attack by
spyware or a virus? Do they just ignore the problem? And if so, how
many people in the world are currently using PCs that are in some way
infected? Do they take the PC to their local PC shop, do they figure
out how to fix the problem or do they just live with it?
In the last two weeks I’ve seen two PCs become so infected by a
virus that the simplest remedy has been to re-install Windows XP and,
of course, that’s only the start of the problem. The operating system
is often the easiest part of a PC to restore. The applications are
frequently more troublesome.