Made of resin, alabaster, glass, steel or iron, Plensa's monumental and varied sculptures are profound reflections on the human condition Published with Fundación Telefónica . Spanish artist Jaume Plensa (born 1955) is known for his monumental public sculptures made of innovative materials such as iron, glass, stainless steel, alabaster and resin. Inner Matter covers more than 30 years of Plensa's oeuvre.