Today I have read an article about the upside-down fly design. Has any
one ever tied this pattern?

Brian Clarke and John Goddard, Brits, in their book The Trout and the
Fly, discuss this fly design at length and provide illustrated
step-by-step tying instructions.

There was also did a program on Public Television (in the USA) titled
"Educated Trout" in which they did the same.

vince