300 million years ago, the Sphenophyta (horsetails, etc.) were rather a big deal, a dominant component of the flora. Some Paleozoic sphenophytes were 100 feet tall. To try to get a sense of what that must have been like, I lay on my stomach on the lawn in a public garden to take a slug's-eye view of an emerging horsetail forest. The sod was cold, and sodden, and to add insult to dampness, I fear I failed to achieve the desired effect. Click to see.
Further unpleasantness: I met a dog while lying prone, taking these pictures. Rather, it met me. Hey! This is NOT an off-leash park.
By the way, there's a trilobite on your head.