  The present work provides a new conceptual framework for GUT (Grand Unified
Theory) based on a picture of fractal universe. Under a hypothesis of
multi-scaled matter structure, we find new clues for the conciliation of
quantum and relativity and for the unification of fundamental interactions. A
new interpretation for matter wave is proposed as the trajectory of position
center of a moving particle with a nucleated structure. The origin of magnetism
and gravitation are discussed as the relativistic effects of electrostatic
force.
