ABSTRACT

How bright is a bright light? How loud is the sound? Did anyone notice that the lights became dimmer suddenly? Did anyone notice that the sound has gradually become louder? Why was the bottlecap in the beach sand mistaken for a coin? Why was the blip on the radar screen mistaken for an enemy aircraft? It was discovered early on that the answers to the foregoing questions was not as simple as noting the number of watts or candlepower in a light or decibels associated with a sound level. “Oops” may have been a good enough answer for the beach sand question, but not nearly good enough for the aircraft question.