When the Jewish People stood at Sinai to receive the Torah, they underwent an experience which was literally out of this world. There was a dislocation of the natural perception of the senses. Sight and sound are very different. Sight operates instantaneously. We see through the medium of light.
Light is the fastest thing in the universe.
It travels at 186,000 miles per second. Sound is relatively slow, moving at about 800 miles an hour. The difference between the speeds of light and sound symbolizes a fundamental difference between the two senses. With sight, we perceive a complete whole instantaneously. After this first sight, we may analyze what we are looking at in more detail, focusing on one element and then another, but the essence of vision is an instantaneous whole.