Jung and Pauli saw some parallels between physics and depth psychology. Pauli was among the honored guests at the foundation festivities of the C.G. Jung Institute in Zürich in 1948. A famous Pauli effect at the ceremony—as he entered, a china flower vase fell on the floor without any obvious reason—caused Pauli to write his article "Background-Physics", in which he tries to find complementary relationships between physics and depth psychology.