Engaging Introduction

At first glance, this image looks simple: a neat arrangement of chocolate-colored triangles stacked into a larger triangular shape. But don't be fooled—this visual puzzle has been making people stop, stare, and question their own perception.

I first encountered this puzzle at a dinner party. Someone passed around a printed copy of a triangle subdivided into smaller triangles. "How many do you see?" she asked.

People leaned in. Eyebrows furrowed. Fingers traced invisible lines in the air. Answers ranged from 10 to 25 to "I don't know, but I'm getting a headache."

I confidently said, "Thirteen."

Someone else said, "Eighteen."

A third person said, "Twenty-four."

We argued. We re-counted. We drew on napkins. No one agreed.

That's the beauty of this puzzle. It's not a math test. It's a perception test. How you see the triangles—which ones you include, which ones you ignore—reveals something about how you process the world.

The challenge is straightforward: how many triangles do you see?

There's no timer, no trick instructions. Just look at the image and count the triangles you can find. Once you have a number in mind, read on to see what it might say about the way you think.

Ready? Count carefully. Then scroll down.