“It’s as though we decided to build a Tardis immediately, on the basis of the knowledge we have about it now – call it the ‘Blue Box’ project. We know it’s blue, squarish, probably uses electricity for some purposes, makes a whooshy noise, travels in time and is bigger on the inside; let’s get started! Of course, we have no idea how the last two things (the time travel and the strange geometry) are done, but then the brain also does things – subjective experience, intentionality, personhood, to name three – that currently seem to be beyond the reach of either science or philosophy.”