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@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 Left image has more natural imperfections and realistic depth: The lighting looks softer and more organically blended with the sky. The Middle and Right images have very symmetrical, overly crisp color patterns and slightly too-clean lighting gradients.

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 The texture of the building's stone facade is incredibly detailed, with subtle variations in color and depth that are characteristic of real masonry, something AI often struggles to replicate without creating a uniform, plastic-like surface.

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 The right image looks more like a real photograph because the lighting, shadows, and architectural details are highly consistent and natural. The buildings follow realistic perspective down the cliff, and the beach scene has organic variation in umbrellas and people.

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 left It looks like a real zoo photo: the concrete wall + log textures feel naturally messy, and the lighting/shadows sit consistently on the tiger and the wood. The right one has that overly “cinematic” smoothness, and the paws/fur edges look a bit smeared/unnaturally clean.

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 Left The lighting, texture of the apple skin, and the subtle reflections on the wooden table are consistent with real-world photography. The background artwork and the way light interacts with the apple’s surface show natural, unforced details typical of a real photo.

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.

@PerleLabs AI This looks way too perfect to be drawn by a hand artist and there seems no visible brush marks over panting. This looks like a strategy to make us think it's a human artist image but actually it's an AI generated image.

Perle Human CAPTCHA Round 2 ✌️ Was this landscape art created by a real artist, or AI generated? Reply with "Human" or "AI" and tell us why! Deadline is Sat, Feb 7th at 11:59pm UTC. This week's answers will be revealed on Sunday. PS: Use your own judgement and trust your instincts!

@PerleLabs H = Human Here is my reason: The lighting is messy and uneven, the street feels real, and there are small random details everywhere. It looks like a normal night photo someone took, not something AI generated.

Perle Human CAPTCHA Round 1 Was this photo taken by a real person or generated by AI? 📸 Reply with a letter and tell us why: H = Human A = AI Deadline to submit is Sun, Feb 7th at 11:59pm UTC. It's go time 👇

Think you can outsmart AI? 😏 Perle's Human CAPTCHA is here. > Test your ability to detect AI-generated content > 2 questions every week > Get 3+ correct across 4 weeks to earn an exclusive badge The real AI challenge begins. First challenge below.

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