The brain does the white balancing for us, and it's way more advanced than any software. The brain can for example do partial white balancing, i.e. it uses separate white balance on different areas. The brain also does object recognition of what you see, which is even more advanced, and then it uses that information to do the white balancing. read more
White Balance (video cameras only) The human eye is so perfect that most people cannot comprehend white balance and its purpose. Since the eye automatically adapts to each new environment, people don’t understand that different light sources emit lights of different colors. read more