Flush is a term that can be used as adjective or as a noun. In the first case, the word refers to what rasa (that is, it touches another body when it moves).
For instance: “The low ball caressed the left post and was lost over the baseline”, “The eagle, in a low flight, captured its prey with its talons and carried it to the top of the mountain”, “It was a low shot and impossible to stop”.
As a noun, the flush is the line of a surface that is taken into account according to the parallelism or the inclination that it presents in front of the horizontal plane. The notion is used in the architecture to name the imaginary line that has a certain angle of inclination.
The building regulations may contemplate the existence of gradients to guarantee the security. On chili, to cite one case, two levels are contemplated in the dividing boundary: the 45 degree flush, which is located on the ground, and the 70 degree flush, located on the upper margin of the dividing wall. These levels cannot be exceeded in construction, renovation, expansion, etc. works.
It is known as grazing light, on the other hand, to the lighting that is applied to a work or a body from a single side and with a weak angle of incidence. This allows you to highlight patterns and outlines with shadows.
In the case of photography and illumination of films, for example, grazing light is obtained by applying a light source with an angle almost perpendicular to the scene, so that the objects have a very strong shading, which increases their sharpness and generates a very particular effect that makes them stand out. Although this technique can be used in an absolutely artificial way, it is also possible to take advantage of sunlight, although in this case good results are only obtained at two times of the day, more specifically at dusk and dawn, since that is when the rays they hit the Earth at the proper angle.
It is important not to confuse the concept of grazing light with that of backlight photography, since this technique supposes the illumination of an object or a scene so that these are between the source of light and the camera, and that the latter point one against the other.
The grazing light in photography allows to create a very particular aesthetic, which can be perceived by the public as unrealistic, even when using sunlight, since the bodies show an appearance characterized by two well-defined regions: the illuminated and the shaded or, in other words, the light and the dark, with a transition brief and violent. In a normal scene, light bounces off a myriad of points and carries with it shades of the colors of the various objects, so the shading is usually much more subtle.
As you might expect, grazing light helps highlight surface defects, and restorers Of paintings and works of art take advantage of this feature to carefully examine objects for imperfections that cannot be detected with the naked eye. A small slit may go unnoticed by a frontal light source, but when focused in profile, one edge is likely to be exposed.
The flush with the sun Kreutz, finally, they are kites that almost touch the sun when orbiting. Heinrich Kreutz he was the one who warned that these comets, which could be detachments from a larger comet fragmented long ago, were linked.