2. A collage of messy random splashes of different colours without any pattern.
4. A neat and symmetrical pattern of geometric shapes.
Explanation:
Abstract painting are just works of art that aren't supposed to realistically resemble an object or person, so random splashes and geometric shapes fit the description, while the 3-D replica, the closely-resembling image, and the photographic image wouldn't be catagorised as abstract paintings.
