Cocoon

Chapter: 32%

When you reach the second set of stepping stones, continue along them rather than hopping off halfway.

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Cocoon has 11 total collectibles known as Moon Ancestors. These can be acquired as you play through the game, or easily mopped up using chapter select once you finish the story. They are most often hidden just off the main path; may involve a small and simple puzzle, and are unlocked with an interaction.
2:19 - 32% - End Of The Line
After empowering the green orb, follow the story path. After taking a rotating pillar, you'll use your ability. Keep using it until the reach the very end of the sequence without getting off. This leads to a secret area where you can find this.

Check the guide below, you need to load at 32%


Timestamps:

00:00 Intro + 0-14% + Off the Beaten Path Achievement
04:49 14% - 17% + Pathfinder Achievement
06:37 17% - 24% + Mariner’s Branch Achievement
09:50 24% - 27% + Mesh Network Achievement
11:12 27% - 32% + Fundamental Changes Achievement
14:01 32% + End of the Line Achievement
14:40 32% - 46% + Skin Deep Achievement
21:45 46% - 52% + Different Destinations
26:26 52% - 56% + From There to Here Achievement
28:21 56% - 63% + Conduit Achievement
32:48 63% - 73% + This Has Potential Achievement
38:59 73% - 81% + Cryptographer Achievement
43:08 81% - 84% The Space Between the Stars Achievement
46:09 84% - 86% + A Perspective on things Achievement
47:26 86% - 90% + Daybreak Achievement
55:13 90% - 97% + Loophole Maneuvers Achievement
1:00:23 97% - 100% Cosmic Architect Achievement