One of the biggest challenges I have faced as a parent is learning that there is not only one way to do things. Train tracks do not have to form a figure eight, peanut butter can be eaten straight from the jar, you don't have to color in the lines.
We went to a Halloween party where he had some stickers to decorate pumpkins to make them look carved. If I had done it I would've made them look how they are 'supposed' to look. The way he did it, however, was way cooler. One looked extra nervous, one looked extra dopey.
It's hard because I grew up where everything had a right way and a wrong way. I was always taught there was one way to load the dishwasher. The one way that maximized the number of dishes while maximizing the effectiveness of the wash. When I was married, I used to scold the ex for putting the dishes in wrong. Until one day he stopped doing it because he always did it "wrong". I realized I was the wrong one.
I grew up with a couple of family members who suffer from Obsessive Compulsive Disorder. When you grow up like that you believe that is normal.
Its hard trying to keep a balance between teaching him how things work and allowing him to play however he chooses.