You don't need to study if grass is green or water is wet, but you're welcome to study why.

If you don't question the basics, you will miss they grass is not always green, depending on environment https://www.australianplantsonline.com.au/imperata-rubra-jap... https://www.oztrees.com.au/product/austrostipa-scabra/ So yes, sometimes you need to study that before assuming that what you usually see is natural rather than shaped.