tyeflies
A fly must look alive---
By alive I don't feel he meant that it should look alive in appearance as in looking identical to the insect it was tied to represent. I feel he meant that the fly must have movement of it's own with hackle, hair or something that would give the impression to the trout of moving legs, emerging wings, etc. A hook with a glob of hair and hackle or tied so well that it looked so identical to the real thing may not entice a strike because it just moved with the current and did not show any signs that looked like it was swimming, moving on it's own, fighting the current, etc. It must have movement of it's own which makes it look "alive" and not just a glob moving with the current. That is my opinion of what he meant by look "alive".
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Warren