Close your eyes and describe what you see
If at first you only ‘see’ the back of your closed eyelids, go with it and describe that
“Dark red . . . swirling morphing shapes . . . lighter yellow spots . . . “ and so on.
At some point you are going to ‘think’ of something, a boat, your kitchen, the dry cleaning, who knows… and you will see a flash of that imagery in your mind.
The more you start imaging things, the more you will ‘see’.
Maybe at first you will only ‘see’ the colours behind your closed eyelids….
The first time you try something doesn’t always mean you will do it perfectly. But you might have ‘beginners luck’ and really surprise yourself.
WARNING: Do this out loud, otherwise you might find yourself drifting to sleep…