Why At Swim-Two-Birds?

My last few Macs have had their hard drives named after Irish or Celtic literary takes on mythology. The last one was Tir-na n’Og and the current one is At Swim-to-Birds. Phil Gyford republishes Donald Barthelme’s reading list and while DB claims it is in no particular order, of course it is in an order and the first book listed is my ‘puter’s namesake by Flann O’Brien (and the inspiration, at least in part, for No Bird but an Invisible Thing):

Phil Gyford: Writing: Donald Barthelme’s reading list