Zippers
From Celeste Wiki
Zippers, sometimes referred to as traffic blocks, are a mechanic first introduced in the first chapter of the game, Forsaken City, but appear in quite a few other chapters. When Madeline touches a zipper, by standing on it or grabbing the side of it, it will zip across its specified distance, hence the name. Zippers introduce Madeline to the core mechanic momentum.
Occurrences
Zippers appear in the following chapters:
All of the Forsaken City chapters (Forsaken City, Forsaken City, and Forsaken City).