Final answer:
The Discobolus is a three-dimensional sculpture carved out of marble with a cylindrical form. It depicts a discus thrower in a dynamic pose. It is an iconic artwork from ancient Greece.
Step-by-step explanation:
The Discobolus, also known as the Discus Thrower, is a famous sculpture from ancient Greece. Its dimensional composition can be described as a three-dimensional figure that is carved out of marble. The sculpture has a cylindrical form, with the figure in a dynamic pose of a discus throw. The dimensions of the sculpture vary, but many examples are around 1.5 meters tall.