Random arrangement of pixels vs. not so.

Totally random arrangement of pixels vs. not so.

By "random" we mean it's reasonable to expect each pixel in the image was chosen with a constant, consistent chance of being black or white.

Random arrangement of pixels vs. arrangement of pixels with some patterns.

By "random" we mean it's reasonable to expect each pixel in the image was chosen with a constant chance of being black or white.

Random arrangement of pixels vs. non-random (patterned) arrangement of pixels.

Random arrangement of dots vs. non-random (patterned) arrangement of dots.

Aaron David Fairbanks