A long time ago I read a SF story in which it was possible to take a snapshot of the last visual and emotional moments of someone who had died. In the story, if I remember it properly, this was used to find murderers (and, I think, subject them to the punishment of feeling and seeing their victim's last moments, over and over again.) I could have misremembered - if anyone recognises the story, do tell me.
Anyway, to get to my point. Just now I read this article.
And wow, guess what, a brain scan of your (living) brain can now tell a researcher what you have been looking at.
That's right. Look at a weed or a house or a flying squid...and there's a difference in the patterns of your neural activity - which can be picked up in a brain scan. Now all they have to do is refine the machinery and their analysis of it and we have a mind reader.
And then...what next?
Imagine something, convert those thoughts into something a machine can read and reproduce - and bingo, photoshop your visual memories anyone? Oh, wow.