> The world is not pure TL;DR: The 'impurity' of the world is an illusion created by our brains. I have a physics degree and I completely disagree. The world

> The world is not pure TL;DR: The 'impurity' of the world is an illusion created by our brains. I have a physics degree and I completely disagree. The world IS pure. Think of it like this: Time is the successive application of a pure function that takes the old universe as an argument and returns the new universe. All science models the real world like this. This is the foundation of mathematics. Nowhere in physics or maths do we mutate anything. Even quantum applies this perspective. This is what leads to the many worlds interpretation of quantum. What's actually going on is your brain is such a powerful illusion machine that it has convinced 'you' that the world is composed of 'objects' that 'change'. This is entirely inside your brain. It is a side effect of the perception process inside your brain. It does not mean the real world is actually composed of 'objects' that 'change'. This illusion is so strong that we then go on to model the real world inside computers with 'objects' that 'change'. This is a mistake that leads to no end of problems. Once you realise the world is immutable, and that the process of time is a function, and that what we see as time is actually a succession of immutable 'universe-values', you then start modelling your problems like this. And then you realise what a better fit FP is for modelling the real world. And then you realise why science models the world using mathematics... that is functions and values... which are immutable. When I argue this with OO developers I ask them "Is the real world mutable, or immutable?" When they answer mutable, I then ask them to go back to last Tuesday and change their lotto numbers. They can't. It's almost as if the past.... is immutable! And the present becomes the past the very moment it comes into being. And the future is unknown. The present also cant be changed. We can affect the future by using our muscles to apply 'forces' to the 'universe-value' thereby changing the way the time-function of the universe returns the new-universe value (the future), but we cannot reach in and alter any of these immutable values directly, not the past, the present, or the future.