When do many grains of sand become a pile of sand?

Look at tribute money from brancacci. which feature of this painting contributes to the drama of the piece

Organum was first developed by religious singers adding another melody directly above the chant and mirroring the chant line. true false

In 1401 a competition to create a set of bronze doors for the baptistery of florence cathedral was held, and this competition is often credited with the beginning of renaissance art t or f?