Children learning how an abacus works, Science Museum, London, 2001.
© Science Museum / Science & Society Picture Library
A 'wizard' explaining to children how an abacus works in The Basement, Science Museum. The giant abacus, the largest in the world, was designed and built by the Interactive Development Unit at the London Science Museum as part of 'Maths Year 2000', a government-funded campaign to promote a positive attitude toward mathematics. The abacus is 4.7 metres long, 2.2 metres tall and weighs 380 kilogrammes.