Premise: The basilica's highlight, and generally accepted as the work of a young Giotto, the Life of Francis (1296-1304) is movingly celebrated in 28 scenes along the lower tier (starting from the right transept), while 32 frescoes in the upper tier illustrate scenes from the Old and New Testament.

Hypothesis: The scenes in the lower tier were created by Giotto near the end of his life.
Relation: contradiction