Grass

"grass" referes to one of two decorations present in celeste. In the original game, and in most mods, it is intangible and immovable. In some mods, such as awake, grass moves slightly when touched by the player.

Grass is also The main character from the mod Celawne, in which the player character is tasked with mowing it all down to complete levels.

Since grass is alive, that makes the player in Celawne a serial killer, and since grass is the main character, this makes it, by technicality, treason.

Some grass from Celawne