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

What is reality? --

Zooming out. Our place in space --

Our place in time --

Our universe by numbers --

Our cosmic origins --

Welcome to the multiverse --

Zooming in. Cosmic legos --

The level III multiverse --

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.