Other Worlds: Space, Superspace and the Quantum Universe (Simon & Schuster, 1980). For more recent developments arguing for the observer-dependence of what is real, see Matteo Smerlak and Carlo Rovelli, 'Relational EPR’,

http://xxx. lanl.gov/abs/quant-ph/0604064 .

Roger Penrose describes his theories on the role of quantum phenomena in the explanation of consciousness in his

Shadows of the Mind: A Search for the Missing Science of Consciousness (Oxford University Press, 1994).

The quotation from Werner Heisenberg comes from his

(Harper & Row, 1962), p. 145.

Some more thoughts on scientific reduction can be found in W. V. Quine’s 'Things and Their Place in Theories’, in his

Theories and Things (Harvard University Press, 1981).

Stewart Shapiro’s

Thinking about Mathematics (Oxford University Press, 2000) provides an accessible introduction to the Platonic view of mathematical objects, as well as to a variety of other theories of the nature of mathematics.

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