"I know what I like when I see it". Have you ever said this or thought it? I’m betting you have. We can all look at something and pass judgment on it. "That’s pretty, that’s ugly, that’s okay but it could be better." What separates an artist/designer from people who "know what they like when they see it" is the artist/designer knows why they like something when they see it. While art is subjective, there are established rules or basics of design that help artists/designers understand what makes artwork look good, bad, and everything in between.