Our mathematical universe: my quest for the ultimate nature of reality

What is reality? --

Part One: Zooming out. Our place in space ; Our place in time ; Our universe by numbers ; Our cosmic origins ; Welcome to the multiverse --

Part Two: Zooming in. Cosmic legos ; The Level III multiverse --

Part Three: Stepping back. Internal reality, external reality and consensus reality ; Physical reality and mathematical reality ; Is time an illusion? ; The Level IV multiverse ; Life, our universe and everything.