It is because flash mobs is a group of people dancing to music and music is art.
Answer:
Flagellation of Christ - Piero della Francesca
V*rg*n of the Rocks - Leonardo da Vinci
The Peasant Dance - Pieter Bruegel the Elder
Explanation:
All of these are notable works that you can easily find more information on by researching the name of the peice.
This is a good site for you:
https://www.britannica.com/art/Oceanic-art
