"A book in the shape of a tetrahedron is pretty close to the general shape of a volcano. Primeval could be showcasing the earth millions of years ago, but is actually showing the current landscape. With a brief description of what happened in the massive 1980 eruption of Mt. St. Helens and overhead photos of the newly reformed landscape, in the aftermath of an earth changing event. Primeval unfolds to 4 panels, 3 foldouts, lots of photos, text about the eruption of Mt St Helens, a colophon, and a sampling of real ash from the volcano, bound with wire edge binding. The book is 5.5" x 6" x 6". Comes with a tetrahedron case. Edition of 20"--From publisher's web site.