The focal point is important because a mistake in this focal point often creates a dull, uninteresting photograph. Almost anything can be a focal point if done right, including a stream, interesting tree, or rock formation. Use the rule of thirds to help you place the focal <span>point within the photograph. </span>
I'm guessing art for art's sake because that's what someone said.
Not sure who helped make painting on canvas a common practice but around the end of the 15th century, canvas<span> became more popular as it was cheaper, easier to transport, allowed larger works, and did not require complicated preliminary layers of </span>gesso.