Art communicates a different message to everyone.
Design communicates the same message to everyone.
You might picture a person on a boat on a lake on a summers day. Some would see that as a nice day out fishing, relaxing - others would see it as being lonely, isolated, bored.
If you that picture on a Mental Health Magazine, the message communicates just fine. If you put that picture on a magazine for cars, it doesn’t make sense. If you put that picture on a fishing magazine, it makes sense. But it communicates a different message than the Mental Health.
I’ve always thought of Art as being a way to communicate to different people. It’s viewed in isolation, away from connection to a feeling. Art communicates as an isolated piece. It can convey emotion and feeling in different ways to different people.
Design combines this with and attaches emotion and feeling, and the same emotion and feeling to everyone.
Even when you consider something like Mondriaan, ‘composition of blue and yellow, ; ~1930’ - in isolation you can ask 10 different people and they will have 10 different opinions. Put that same painting in a design piece, with a message that makes sense and you have the same opinion from 10 different people.
Design is communicating the same message.