Sufficient reason

"There must be a sufficient reason [often known only to God] for anything to exist, for any event to occur, for any truth to obtain."

 LEIBNIZ AND MONADOLOGIE

The monads

Leibniz's best known contribution to metaphysics is his theory of monads, as exposited in Monadologie. Monads are to the metaphysical realm what atoms are to the physical/phenomenal.[citation needed] They can also be compared to the corpuscles of the Mechanical Philosophy of René Descartes and others. Monads are the ultimate elements of the universe. The monads are "substantial forms of being" with the following properties: they are eternal, indecomposable, individual, subject to their own laws, un-interacting, and each reflecting the entire universe in a pre-established harmony (a historically important example of panpsychism). Monads are centers of force; substance is force, while space, matter, and motion are merely phenomenal.

The ontological essence of a monad is its irreducible simplicity. Unlike atoms, monads possess no material or spatial character. They also differ from atoms by their complete mutual independence, so that interactions among monads are only apparent. Instead, by virtue of the principle of pre-established harmony, each monad follows a preprogrammed set of "instructions" peculiar to itself, so that a monad "knows" what to do at each moment. (These "instructions" may be seen as analogs of the scientific laws governing subatomic particles.) By virtue of these intrinsic instructions, each monad is like a little mirror of the universe. Monads need not be "small"; e.g., each human being constitutes a monad, in which case free will is problematic. God, too, is a monad, and the existence of God can be inferred from the harmony prevailing among all other monads; God wills the pre-established harmony

  

             

Common Lighting Terminology

Ambient Light	The light already present in a scene, before any additional lighting is added.
Incident Light	Light seen directly from a light source (lamp, sun, etc).
Reflected Light	Light seen after having bounced off a surface.
Colour Temperature	A standard of measuring the characteristics of light, measured in kelvins.
Contrast Ratio	The difference in brightness between the brightest white and the darkest black within an image.
Key Light	The main light on the subject, providing most of the illumination and contrast.
Fill Light	A light placed to the side of the subject to fill out shadows and balance the key light.
Back Light	A light placed at the rear of a subject to light from behind.
Hard Light	Light directly from a source such as the sun, traveling undisturbed onto the subject being lit.
Soft Light	Light which appears to "wrap around" the subject to some degree. Produces less shadows or softer shadows.
Spot	A controlled, narrowly-focused beam of light.
Flood	A broad beam of light, less directional and intense than a spot.
Tungsten	Light from an ordinary light bulb containing a thin coiled tungsten wire that becomes incandescent (emits light) when an electric current is passed along it. Tungsten colour temperature is around 2800K to 3400K. Also known as incandescent light.
Halogen	Type of lamp in which a tungsten filament is sealed in a clear capsule filled with a halogen gas.
Fresnel	A light which has a lens with raised circular ridges on its outer surface. The fresnel lens is used to focus the light beam.
Incandescent	Incandescent lamps produce heat by heating a wire filament until it glows. The glow is caused by the filament's resistance to the current and is called incandescence.