The circles you're looking for are both on the same window

The room you're looking for has windows through which you can see red-orange colored swamp water

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This puzzle starts with the circle on the left

If you're having trouble finding the right room, start at the rotating L-shaped platform and head down the walkway with the purple tile. You'll soon come upon the set of stairs leading down to the room where you can find this puzzle.

From the stairs, turn left and you'll see two circles on the window. Stand near this window and look towards the circle on the left. Continue to adjust your position until the color of the water in this circle matches the yellow color of the line painted on the wall to the left. The circle will take on a distinctly oblong or oval shape when you have it aligned properly.

If you haven't already guessed, the circle to the right of this one is also an environmental puzzle. While you're here, you might as well get this one, too.

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The shape that you're looking for is a circle next to another circle

This one is not visible from the obelisk

You will find it down stairs

It would be misleading, however, to say this one is underground

Underwater would be more accurate

The stairs you're looking for are in the Color Swamp

Color is the key