Daylight sky, with emphasis on daylight, and ocean blue only for people living next to a large body of water. Objects in nature are rarely blue. At night, nothing is blue, most of our history the only color at night is the orange-reddish of the camp fire (and yes, 100 years of light bulbs don't replace 50,000 years of conditioning of camp fires).
Since the sky and the ocean are blue, that suggests a majority of visual field in nature contains blue in most cases.