Indescribable, mad book, but fun.
A blue bear tells of his bizarre adventures (half of his 27 lives) in a fantasy world of extraordinary creatures. Rescued and raised by mini pirates, taught to talk by Babbling Willows, navigator for a pterodactyl superhero etc etc. Interspersed with snippets from an encyclopaedia about the relevant creatures (shades of Hitchiker's), and plenty of pen and ink illustrations.
The overall effect is like a more adult version of Stewart and Ridell's Edge Chronicles, with touches of Python, fairy tales, Munchausen, Gulliver's Travels, Edward Lear and goodness knows what else.
Lovely use of language, quite apart from the extraordinary imagination behind it. "A dimension could, for instance, consist of congealed boredom or musical frigidity... there are said to be dimensions in which sorrow is the staple food of creatures that vegetate in little pools of grief", "Qwerty oozed majestically" and a clever description of "equitemporal tunnelling of dimensions" whereby time "can vanish while remaining omnipresent"; riding a horse is like moving in time to classical music but riding a camedary is more like a drunk drummer's rhythm.
Also a big book (over 700 large pages) but such fun it's only heavy in the sense of pound and ounces (or Kilos, if you prefer).