These sculptural bookends by Chicago-based artist Garth Borovicka cleverly utilize the layers of wood and the growth rings within to symbolize the sedimentary layers of the Earth. They compare microcosms and macrocosms, exploring the similarities of naturally occurring patterns on small and large scales. Via his website, "In both instances these patterns represent the passage of time on either a relatively short span or a massive one. As a further play with the theme of scale, each set is cut from a larger landscape built by the artist. When displayed as bookends they make reference to the life cycle of a tree and its various uses."
Find out more about Garth's work here and here.