I will happily put my hand up and say The Gallery Portrait by George Perec (the third of these three) is the best short story I have ever read. It consists of a description of the history and content of a single painting, but to say any more would give it away. It's a wonderful introduction to what Perec can do when he's let loose and anyone who likes this will love Life: A User's Manual.
Also in this volume are Who's Bike with the Chrome Plated Handlebars....., in which every literary form and device is crammed into 20 short pages, and The Exeter Text, which is a lipogram in a, i, o and u.
It is a travesty that this book is out of print while the DaVinci code is a bestseller.