What do the dark and light bands represent?

In 1907, the retrospective on the work of 19th century post-impressionist georges seurat influenced the development of cubism in a radical way through his painting titled, “sunday afternoon on the island of la grande jatte.” ? ?

The energy applied to cause vibration can be in the form of air pressure a stick, bow, or electricity. true or fasle

What do you know about the principles of design and the elements of art?