I love to tie micro-flies by challenge. They surprise the most suspicious fish. They allow fly fishing for the smallest species of cyprinids. They optimize the cerebral calibration of hooking by measuring gesture and speed. Too slow, too strong, the hooking is missed and the thin leader breaks. It is a fly fishing of sensation, delicacy and skill. I like to tie imitation of mayflies, diptera, beetles on hooks from number 20 to number 30. It's difficult and the results are surprising.