The purpose for artists being driven to create art for many different reasons seems to for an aesthetic purpose. This looked to be the purpose of Edvard Munch when he created his masterpiece in 1893, named the Starry Night. The subject of this work is the division of the water, earth, and sky but rejoins in a huge unity.
Q1. thatched roofs Q2. Druids
Your answer would be: Fine details and rich tonal variations!