Observations: The tallest book in the world

What do you buy the oligarch/sheikh with everything? How about the tallest book in the world? At 14ft, The Burj Dubai Opus is a record-breaking page-turner – though it's not clear how many competitors there might be, or, indeed, if it's even possible to turn its hefty pages.

The tome, from Kraken Opus, will chart the evolution of the heaven-scraping Burj Dubai, which will be the world's tallest building when completed later this year. The one-off "publication" will go on display in the tower's lobby and there are special versions and collectors' editions, containing massive photographs, long interviews and super-sized behind-the-scenes gossip about the architectural marvel, for sale. Just don't ask for gift-wrapping..