 Epicurus made significant changes to atomist physical theory. It seems that Democritus did not distinguish clearly between the physical uncuttability of atoms and their conceptual indivisibility: this raises a problem about how atoms can have parts, as evidenced by their variations in shape or their ability to compose a magnitude, touching one another in a series on different sides. Epicurus distinguished the two, holding that uncuttable atoms did have conceptually distinct parts, but that there was a lowest limit to these. Different solutions to this problem are found in ancient Indian atomism.