The (first) Donkey
Designed by Egon Riss and Jack Pritchard
Manufactured by Isokon, London, 1939
The owner of Penguin books was so impressed with The Donkey bookcase he offered free advertising in his paperbacks. The Donkey was later renamed The Penguin Donkey, which happens to hold 80 Penguin paperbacks quite nicely.
Photo from V&A archive [vam.ac.uk]