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@PerleLabs Middle Simple reasons why middle is the AI-generated one:Wrong flag on top: It's the Turkish flag (red with crescent and star), but the Leaning Tower is in Italy should be the Italian tricolor.

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. Consistent Lighting: The light source (the sun) is low on the horizon, which matches the warm "golden hour" glow on the bottom of the clouds and the side of the balloon.

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 The topographical composition, lighting, shadows, and detail density are very natural; small objects (boat, house, tree) have reasonable variations and do not repeat patterns — characteristic of a real photograph.

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 is in a dense, realistic forest setting with dappled sunlight filtering through the canopy, creating natural shadows and highlights on the ground and foliage. The scene is consistent with a tiger's natural habitat.

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 has natural, subtle variations in its peel texture and color, with realistic light reflections and shadows that match the ambient light of the kitchen scene. The wood grain on the countertop is consistent and detailed, with natural wear patterns.

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 H I feel it's because：The overall spatial relationship and light and shadow atmosphere present the documentary texture of real shooting, without the sense of violation and logical loopholes in AI-generated images.

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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