Childcraft again. Volume 7, How We Get Things: Dots Make Pictures
Do you see dots before your eyes when you look at the picture on this page? you would if you looked at the picture through a special magnifying glass. When pictures are printed in books, the patches of color and the shades of gray are really many, many tiny dots. The picture on the next page shows you how dots make a clown's face. Where the colors of his face are light, the dots are far apart. Where the colors are dark, the dots are close together. [reminds me of something I suggested earlier today: intensity is type of substance, depth is its frequency-wavelength-or-color, which might be useful in optical devices and filters]
