Simple answer is you interact with things when observing them, an apple needs to have light hit it, energize its electrons, those electrons become unstable drop energy levels and give off visible light which we perceive, we can say the apple is red in this case. Adding a light source to see what color the apple is, effects the apple to some degree. What we can also do is observe what the apple has done to other things in its surroundings. For this example let’s say the apple was rolled down a snowy hill, we know what a snowy hill looks like without an apple rolling down it, we notice a small path and we see a round indent. We can kinda infer that the apple is small and that it’s also kinda round, but less accurate information is gained this way. I hope this helps.
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