Today is World Book Day. To mark the occasion we've rounded up 10 of the best ways designers have stored books, from bookshelf staircases to a huge concrete case that spans the wall of a Mexico City home.

Home Cafe, China, by Penda
A modular system made from steel forms the partitions of this cafe in Beijing by Penda, populated by wooden boxes designed to store books and display plants.
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Barn conversion, Belgium, by Studio Farris Architects
A Jenga-like structure in Studio Farris Architects' barn renovation forms a staircase with an integrated workspace. Its overhanging treads form shelving and cupboards for the client's books.
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Pedro Reyes' House, Mexico, by Pedro Reyes Spanning one wall of the lounge in sculptor Pedro Reyes' Mexico City home is a huge double-height bookcase made from concrete slabs, with a gallery space accessed by cantilevered steps.
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Silvia Allori's House, Italy, by Silvia Allori
Pegs slot into holes in the walls of Silvia Allori's self-designed apartment in Florence, forming customisable bookshelves. A further bookcase is hidden behind a fold-down panel that opens to form a desk.
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The Plywood Trio Apartment, Spain, by Buj+Colón Arquitectos
When redesigning an apartment in Madrid, Buj+Colón Arquitectos added a plywood staircase with built-in cupboards below each tread for the client ...