Since 2009, artistically designed stained-glass windows by Sigmar Polke have decorated the Grossmünster Church. This well-known German artist crafted seven windows in the nave from agate. He cut this semi-precious stone into thin slices that would let light pass through them and have the appearance of brightly glowing walls. The brilliantly colorful result was then expanded with five figurative glass windows. The motifs feature Old Testament figures: The scape-goat, Isaac, the Son of Man, Elijah and David. They are all moving in the direction of the birth of Christ and thus toward the chancel window created by Augusto Giacometti in 1933.