Not sure if this has been discussed before (probably has been done many times already). But what's the difference between still life and abstract?
Still Life - Image of one or more object/non living things as the subject being photographed. Normally no image of a person or living things in the picture.
Abstract - A portion of any object/person/living or non-living things being photographed. Does not show the entire picture but rather a section of that object. Normally done using interesting colors or shapes.