So, tell me, what color is the sun? Yellowish, right? But outside of our atmosphere, it looks white. Sunlight also contains all seven colors of the spectrum, atmospheric conditions just have us seeing the yellowish and sometimes red parts, never the green and never the blue. We have a blue sun as much as it is a yellow sun, WE just never see it as blue under our atmosphere.
But there is no inherent "yellowness" built into the sun, there is no "greenness" in grass, and there is no sound built into a falling tree. It takes certain conditions to make these things happen, they are not within the objects themselves. A falling tree does not make sound to a deaf person, nor does it make a sound if no one is there to hear it because all the conditions of what we've defined as sound aren't being met. Again, if we were all deaf, we wouldn't be talking about sound at all. So how can you say a falling tree DOES make a sound all the time? It obviously doesn't under those conditions. Reality is subjective upon the person experiencing it.
Plato's Allegory of the Cave:
http://faculty.washington.edu/smcohen/320/cave.htm