"Master, I overheard your conversation with Ling about communications with an E.T. [201. Why is vision so much more desirable than sound? Can we EVER produce Grieg's piano concert in pictures?"
"That is not it. Your concert is pure emotional ideation, pure stroking of the Mind, not informative at all. A message has a different object, not to please but to share Truth. Vision then, is by far the most complex sense. Thus it carries the capacity of unlimited precision as well as all variety in messages. Not only can you teach by it how an E.T. could 're-produce' Grieg's concert up till the very construction of the grand piano, it can also make a Japanese firm produce whatever intricate piece of machinery or spare part you like, mainly from a mere piece of paper. Besides, vision makes the principle of 'blinker' very much better possible."
"But that is for stereoscopic sight, Master, E.T.'s might not have that."
"Do not forget what a housewife does when she wants to compare a particular shade of colour in dress or wool (Spencer). She brings a sample with her BUT ALSO holds it close to the desired. Thus the eyes can flash back and forth between the two, independable of stereoscopics. It cannot be done at a distance, nor from pure memory. Yet, remember, that comparison ALWAYS is a Time principle, just like the blinker. What does one do in order to compare two tones? One sounds the two alternatively, one AFTER the other. A Time sequence. The longer the distance (in time, space, between the colours), the more difficult the comparison is." [100], [201]