My definition of magic: Magic is anything which makes other code behave in a way that would require reading the magic to understand, despite not being apparent

My definition of magic: Magic is anything which makes other code behave in a way that would require reading the magic to understand, despite not being apparent in the magicked code. Good because it makes many things a lot easier, bad because it makes code a lot less explicit and simple and increases cognitive load (you need to always consider the magic not just the current code you're looking at).