From wikimedia commons: Haarfarn (Maidenhair fern) from "Urformen der Kunst"(The original art)
This bad boy spent his entire career photographing plants at ginormous magnifications. You can see a huge collection (120 images!) here. Just click on "das werk" and then "unformen der kunst." Some of these things look like buildings, others like ironwork, and still others resemble, vaguely, people.
The tip off came from a wonderful Etsy seller, HummingbirdEyes, whose artful shop you can visit here. Take a look at her rad assemblage, "Evolution."