I can't. Never have been able to . I thought it was just a figure of speech but turns out it really is a thing.. people can visualise something not in front of them!
Aphantasia is the name for not being able to (ie me). Not that it's caused me any problems except for not being able to imagine my dh's latest DIY project
but I can't even picture my own kids..I can describe them but I can't 'see' them in my head.
I'm also not very emotional and can move past difficult things/events/sadness in a way that has always slightly worried me (not that I don't care, I do, but it doesn't haunt me) and I wondered if that was conencted, because I can't mentally revisit things.
Just wondered how common it is really?!