A answered. Atrial fibrillation can be caused by a number of different things that predispose the heart to arrhythmias. Most commonly, longstanding high blood pressure is the cause. Other causes include heart disease such as blockage in the coronary vessels or diseases such as pneumonia or COPD.
A board, typically with a hole for the thumb, which an artist can hold while painting and on which colors are mixed. 2. a. The range of colors used in a visual medium, in a picture, or by an artist: a limited palette.
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.