Tall Grass is a terrain feature present in the earlier versions of the game, and was later removed for an unknown reason. It performed no function and according to Geistermagier, "just look[ed] cool". It was animated, and had three frames.
Tall grass consisted of three different frames, each with three protrusions from the base, and they skewed from left to right. The first and last frames, the ones with skews, noticably persisted longer, to give the effect of swaying in the wind.