There's some timing involved here. You'll need to do just a little bit of running to solve this puzzle. (More like a quick jog.)

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The color purple will help narrow your search

Look for this one in the Color Swamp

It is on the swamp floor, formed from purple shapes.

Starting from the obelisk, head down the path that leads to the summit. After passing by the greenhouse, the pathway will fork. Take the path on the right then stay to the left and you should reach a rock outcrop overlooking the purple portion of the Color Swamp.

There are a couple yellow platforms here that can be moved by solving a panel puzzle nearby/below. If you haven't done this yet, the platforms will be covering up this puzzle. Try a couple different solutions on the panel, moving these platforms into different positions to uncover this puzzle.

While you're learning how the platforms work, you can stand directly on the middle square (the one containing the actual puzzle). That way, you won't find yourself stuck on the wrong side of a moved platform. Keep at it, though, and you'll understand how it works soon enough.

One more thing: There are two more environmental puzzles in this same location, each requiring the platforms to be in different positions. Before moving on, you might want to play with these platforms until you uncover all three.

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If you have solved a puzzle that moved a platform, you may have already uncovered this puzzle

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Not very close to the obelisk, but not very far either

Should only take a short hike to get there

The exact location of this puzzle might be described as a bit murky

To see this one, you'll need to look down on it

Solving this one won't require DEEP thinking