With his etching, The Frog of the Tour, Charles VIII, Amboise, Arms continues with his fascination of gargoyles. Château d’Amboise is the grand 15th century residence of King Charles VIII. One of the most interesting aspects of Amboise is its Gothic spires and roof tops, ornamented with fantastic gargoyles. The frog of the tower is a gargoyle. This elongated frog, designed as a conduit to drain water from the roof, protrudes horizontally from a roof drain. Its angle and its opened mouth force the stream of water outward protecting the sides of the building from the falling water.