Before you read this post first ask yourself “what is design?”
In my opinion design is a message that you deliver to peoples who don’t allow you to deliver your emotions and feelings directly to them.
Many professional persons do not want cheap marketing, they think to have something unique and easy to be understood, what their services or product are. Also they are not able to ask everyone about their profession/product, so they deliver their messages by designs.
Every design you can see have different and variety of own unique messages. Some have hidden or abstract messages, and some are visible and easy to understand. They convey the purpose what a person/company want to tell you.