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David Eagleman's recent TV programme (BBC4) about reality and the brain described the virtual reality the brain constructs using signals from external reality. He talked about the EM radiation and pressure waves that our senses passed on to the brain.

At the end he posed the question as to what reality really is. The answer was disappointing: he said reality is whatever your brain tells you it is! What a cop out!

So what can it be like? Electromagnetic radiation. Tons of it. Emitted and reflected. Of all wave lengths.

There must be pressure. There must be molecules. Otherwise sound and taste sensors would not work as they do.

Some groups of molecules must stick together better than others because they give us the illusion of solid objects. But most of an atom is empty space delineated by electrons which can't be pinned down to anywhere in particular, so even groups of molecules are mostly empty space.

Very hard to even begin to imagine.......