。

@PerleLabs MIDDLE Even if the tower is recognizable, the image feels like an idealized postcard: clean, precise, and evenly lit in a way that’s atypical for candid photography.

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 The right image has more natural imperfections—subtle inconsistencies in reflections, realistic road texture, and slightly less “idealized” lighting, which makes it feel more like a real photograph.

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 Right The trail, leaves, and branches around have a natural messiness, and the depth of field (background blurring towards the back) is similar to a photo taken with a real telephoto lens.

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 Left apple: Too uniform glossy shine, plastic-like perfection — typical AI over-polish. Right orange: Natural peel texture, subtle bumps/pores, organic color variation and shadows — matches real photo quality.

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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