Maybe you were late for work this morning, maybe you've just broken up with your long-term partner, maybe you left your phone on the bus. Well, you'll be pleased to know that none of this matters because nothing is real and the world you live in is just an illusion. So that's a relief. So, if you fancy adding a bit of existential angst to the bad day that you're having, then consider the reality that everything from your favourite painting to your childhood memories to the universe itself are just mirages, created by quirks of biology, chemistry and physics. If that's a bit of a downer for you, then we can always take the perspective that the universe is a weird and wonderful place, and the more you look at it, the weirder it gets. What's more, your brain has managed to create this weird world for you using just five senses and a healthy amount of imagination. So, let's delve into the reasons why nothing really matters and reality is an illusion, so you may as well have that extra brownie.