How is the political context different for this mural than it is for the billboard?

Compare your ideas to the ones below. What other reasons did you come up with? What is missing from this list?
The billboard...	The mural...
Billboards are made to promote a product and persuade people to buy something.	A mural such as this one sends a very different message. It makes a statement about how viewers should see the future.
	It was created during the Nicarguan Revolution when there was disagreement as to how the Nicarguan government should operate and who should be in the government. Knowing that, we can understand the mural as making a political statement of a particular view about this is important politically.