Coming it at over 11 pounds/5 kilos - this isn't your average cookbook. If the feather doesn't clue you in then maybe
the distinctive silhouette will.
It is The Big Fat Duck Cook Book by Heston Blumenthal.
I don't even know if cookbook is really the right word to describe it. It's not something that I'll be lugging into the kitchen and it's certainly not something you can snuggle in bed with.
There's a lot to digest and while not entirely practical, it will be highly informative and fascinating.