Yeah, in a cup of milk you can make a sunset. If you set the situation right, you can create the same orange and red colour patterns as you see when the sun sets down. The fibres that make your cup of milk orange and red are exactly the same fibres that make the sky orange and red at sunset. In this respect, in your cup of milk you can really make a sunset. In order to do so, you don't need the sun. Let's start with the fundamental physics and then we will realise how to make a cup sunset.