Important Caveat 1 : What they built is a lot more limited than you might imagine just by looking at the pictures.

Important Caveat 2 : This isn't memory, it's decoding what the user is currently looking at. Even as this technology gets better, it remains to be seen if the human brain can even recall a memory coherently enough to extract it like this.

But still : It's a real step towards a technology that sci-fi writers have fantasized about for generations. And even if it never works on "memories", it could be huge for people with disabilities. And of course, if it ever got cheap, people would use it to record dreams.