[VFB] Is it me???

[Desert Eagle]

Or is it a common trait of fly tiers. I find that I set down to tie a number
of one fly, after about 3 or 4 I start changing some things. Sometimes just
little things, others I start creating something only vaguely resembling the
fly I started on.Not always mind you, just on some particular, (like nymphs
and streamers, clousers and such). Just wondered if I was odd or if it was a
normal trait.
Jimi