"it came about the so many ideas due lying drunk in a field in Innsbruck.."
See also, A GUIDE TO THE GUIDE
Some unhelpful remarks from the author, "The idea for the title first cropped up while I was lying drunk in a field in Innsbruck, Austria, in 1971. Not particularly drunk, just the sort of drunk you get when you have a couple of stiff Gassers after not having eaten for two days straight, on account of being a penniless hitchhiker. We are talking of a mild inability to stand up."