I am not talking about the inoffensive ones with the puzzle pieces. I am not talking, even, about matching or rotating shapes. I am talking, specifically, about the grid of insane photos — the kind of thing you may be familiar with from Google’s reCAPTCHA system. If you are looking for a measured take on why they exist or the efforts to build replacements, go read this. I am not feeling measured, although I will resentfully note that CAPTCHA exists in order to stop bots and does an okay…