129. A line, one extremity whereof strives towards the centre, the other to the periphery, the one to identity, the other to duality, will exhibit itself in the world as a _line of Light_, in the planet as a _Magnetic line_. Magnetism is centroperipheric antagonism, a radial line, 0--±, the action of the line being cleft at one extremity. Magnetism has its root in the beginning of creation. It is prophesied with time. SURFACE, ELECTRICITY, OXYDATION. 130. The periphery is the boundary of the sphere, and is, consequently, a superficies or _Surface_. This, therefore, originates also directly with the positing of the Eternal. 131. As the primary line is not a purely polar, but a radial line, so is the primary surface not a level, but a curved or convex surface. 132. There is _no level_ surface in the universe, no pure surfaces any more than pure lines. All surfaces are curved. For example, those of drops, of the heavenly bodies, of animals. The surface of a sphere is no _Continuum_; but consists properly of the divided peripheric and upright extremities of the radii; it is a ±. 133. The surface of a globe has no centre, no 0, like the radius; but is an absolute Dualized, a ± without 0. 134. This mode of operating of the primary act is manifested as electricity. Electricity is a merely peripheric antagonism, without centre, thus without union; an eternally Dissevered without rest. Electricity is thus also a special form, under which polarity makes its appearance, and is likewise rooted in the primary creation. There is, consequently, no thing which were not magnetic and electric. 135. The idea of a surface is constantly that of _surrounding_. It is not generated by a section of a globe, but by the completion, the _circumferential limitation_ of the sphere. The essence of the sphere is _boundary_. Every surface is finite, is convex. In the divine position a surface never occurs, save on the boundary of the primary sphere. 136. As no thing can exist without a line, without a radius, so also none can be without surface, without circumscription. The single surface is identical with the _Locus_ of the old philosophers. Every Finite is a closed whole, and that thing is of the most perfect kind which has the most perfect closure, surface, periphery (or skin). 137. The surface is also not different from the primary act, but a form of the primary act itself; or a boundary, which, however, nowhere remains stationary, but is always displaced by means of the eternal act. Therefore the world is at once unlimited and limited; the latter in reference to the closure of the surface, the former to the endless expansion of the same.