Interesting research: “ An Empirical Study & Evaluation of Modern CAPTCHAs “: Abstract: For nearly two decades, CAPTCHAS have been widely used as a means of protection against bots. Throughout the years, as their use grew, techniques to defeat or bypass CAPTCHAS have continued to improve. Meanwhile, CAPTCHAS have also evolved in …

There are these. [...]

This is an actual CAPTCHA I was shown when trying to log into PayPal. As an actual human and not a bot, I had no idea how to answer. Is this a joke? (Seems not.) Is it a Magritte-like existential question? (It’s not a bicycle. It’s a …