*Hydrocephalus facts medical author: Melissa Conrad StÃ¶ppler, MD. Hydrocephalus is a condition characterized by excessive accumulation of fluid in the brain. Hydrocephalus may be congenital or acquired. Communicating hydrocephalus occurs when cerebrospinal fluid (CSF) can still flow among the ventricles. Noncommunicating hydrocephalus, also called obstructive hydrocephalus, occurs when the flow of CSF is blocked. Hydrocephalus affects about 1 out of every 500 children. The most obvious indication of hydrocephalus in children and infants is often a rapid increase in head circumference or an unusually large head size.
Local color (visual art). From Wikipedia, the free encyclopedia. In painting, local color is the natural color of an object unmodified by adding light and shadow or any other distortion. Local color is best seen on a matte surface, due to it not being reflected, and therefore distorted. In fine art realism, local color is the color the brain perceives an object to be. For example, an apple is red.
Color gamut. The term color gamut is used in connection with color in absolute terms and the reference for absolute color is the human vision color space. Human vision colors can be defined with a color model which consists of one achromatic component and two chromatic components.