This brooch contains a minature picture of american statesman henry clay likely owens by clay or his ancestors this brooch is valued for what reason

The brooch was a historical heirloom passed down the ancestral line for many generations.

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

Answerencaustic and fresco;