A New York artist, based in Glasgow, Ilana Halperin presented her artworks from 27-01 to 23 -09 2012, at the Berliner Medizinhistorisches Museum der Charité. The relief entitled "Physical Geology" required 8 months of work under the waterfall. Inspired by abstract geological patterns, the result reveals the special aspect of calcium carbonate. Its fineness cannot be compared to any other matter. The artist invites the public to question about that unique material still little used in the world of art.