Clara

@PerleLabs Middle Tower of Pisa is the AI one! Architectural patterns and the crowd at its base show subtle, "too-perfect" repetitions and blurry textures typical of AI. It lacks the gritty, imperfect details of real stone and the sharp, distinct silhouettes.

Alright… this is it. Final Human CAPTCHA challenge 👉👉 We saved the best for last. There are 3 images. Only ONE is AI-generated. Your job is to tell us if it's the one on the Left, Middle, or Right. Submit your guesses by Sat, Feb 28 at 11:59pm UTC. As usual we'll be revealing the answers on Sunday! If you got 3+ right, we’ll share how to claim your reward next week.

@PerleLabs Left The lighting and shadows feel more natural and the background balloons don’t look overly perfect or stylized. The texture on the main balloon also has slight irregularities that you’d expect from a real fabric not a clean AI render.

It's the final week of Human CAPTCHA: Round 7 You made it this far… but we’re not going easy on you. One of these is a real photograph of a hot air balloon, the rest is AI-generated. Can you tell which one it is? Respond with Left, Middle, or Right and tell us why below! Submissions close Sat, Feb 28 at 11:59pm UTC. Answers revealed Sunday.

@PerleLabs Right Natural Lighting & Shadows The lighting on the right car matches the environment. Shadows fall consistently with the building and street, making it look physically present in the scene.

Perle Human CAPTCHA #6 🏎️ One of these sports car photos is real. The other was generated by AI. Comment “left” or “right” with your guess, and tell us why 👀 Submissions close Sat, Feb 21 at 11:59pm UTC. Answers revealed Sunday.

@PerleLabs Right This is because there's natural depth variation in the mountain and buildings and also a slight atmospheric haze in the distance ( which is very common in real coastal photos).

Perle Human CAPTCHA #5 📸 Let’s keep your captcha streaks alive. One of these vacation photos is real, and one was generated by AI. Which one is real? Reply "left" or "right" and explain why ↓ This week's submissions close Sat, Feb 21th at 11:59pm UTC. Both answers will be revealed on Sunday.

@PerleLabs Right The tiger's fur texture has "imperfect" detail: a few tangled hairs, light dust, and uneven light reflections—things that AI often smooths or fakes don't quite match.

Perle Human CAPTCHA #4 It's time to put your human judgement to the test again. One of these images of a tiger is a real photograph, one was generated by AI. Which one is real? Reply "left" or "right" and tell us why ↓ This week's submissions close Sat, Feb 14th at 11:59pm UTC. Both answers will be revealed on Sunday 👀

@PerleLabs Right The orange on the right has more natural lighting, surface texture, and realistic imperfections.

Perle Human CAPTCHA #3 📷 One of these images of fruit is a real photograph, one was generated by AI. Which one is real? Reply "left" or "right" and why 👇 You have until Sat, Feb 14th at 11:59pm UTC. This week's answers will be revealed on Sunday.

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