The definition of art.
Art: the expression or application of human creative skill and imagination, typically in a visual form such as painting or sculpture, producing works to be appreciated primarily for their beauty or emotional power.
I believe that art is made by humans to be used as something of significant impact. It could be a still life of oranges or a propaganda piece from WWII. Both pieces alike can express an idea or feeling. The oranges, while seemingly ordinary and realistic can bring about happiness from its viewing. The color can capture the eye and possibly carry a deeper message. For example, the painters mother could have loved oranges and she has passed away. To the artist that painting is a representation of the dead mother. Therefore it has meaning.