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I am not sure what the others thought about it (for example Kahlo and Rivera were communists, so they likely believed it too!)
but a very good answer is <span>B. David Alfaro Siqueiros, since he was very opened about this view, stating it many times. </span>
It could represent infinity because the ocean looks infinitely long. also, the sky is blue during the day, so blue could also represent infinity that way.
It didn't really benefit them. It only benefited the people that sold slaves because they got money. The only other positive thing i can think of is if they took slaves from overpopulated areas.
