We’re literally blind to that which the brain ignores. If it sends the eye to only the distressing elements around us, that’s all we’ll see. If it spins cause-and-effect tales of violence and threat and prejudice about actually harmless events, that’s what we’ll experience. This is how the hallucinated reality in which we live at the centre can be dramatically different to that of the person we’re standing right next to. We all exist in different worlds. And whether that world feels friendly or hostile depends, in significant part, on what happened to us as children.