Optical Signal

Famous quotes containing the words optical and/or signal:

“There is an optical illusion about every person we meet.”
—Ralph Waldo Emerson (1803–1882)

“The experience of a sense of guilt for wrong-doing is necessary for the development of self-control. The guilt feelings will later serve as a warning signal which the child can produce himself when an impulse to repeat the naughty act comes over him. When the child can produce his on warning signals, independent of the actual presence of the adult, he is on the way to developing a conscience.”
—Selma H. Fraiberg (20th century)