Introducing Graphic Guides - which celebrate their 20th anniversary in 2012 - have long been revered for bring big ideas to a mass audience - and making them enjoyable.

Here are three box sets, each containing three popular titles, brought together to highlight particular strengths of the series:

Know Thyself - contains Psychology, Mind + Brain and Consciousness

Great Theories of Science - contains Quantum Theory, Relativity and Chaos

Think For Yourself - contains Philosophy, Logic and Ethics