Gierach definitely understood and appreciated both bamboo and double guns as a rare glimpse into his “inner sanctum” confirms.
From Louis Cahill:
“A hundred bamboo fly rods, most of them old, are stacked on every flat surface and leaning against every wall. The room smells of oil cloth and leather. Beautiful old side-by-side shotguns guard every corner; the ones in racks on the wall next to oil paintings by Bob White. Rows of classic trout reels and larger Spey reels and in the far back corner of the room an old wooden office chair and, I trust, a desk hidden under that mound of hard bound books. This, I assume, is where the magic happens.”