Richard Held and Alan Hein raised 20 kittens in pitch black darkness. Which is the kind of thing you should only do if it’s necessary to prove a point critical to understanding how the world works. Thankfully they did just that.
The two MIT cognitive scientists, working in the 1960s , showed that seeing the world around you was not enough to understand how it works. You had to actually experience that world to learn how to operate in it.