anchor: The 85-m- (267-ft-) tall bell-tower (it's a 414-stair climb to the top) is decorated on its lower sections by hexagonal bas-reliefs sculpted by Andrea Pisano and Luca della Robbia, based on Giotto's drawings.
positive: The the lower portion of the tall bell-tower is embellished with sculptures based on Giotto's sketches.
negative: The high tower was never decorated with sculpture.