The characteristics of printed material that contribute to its ease of reading, including factors that reduce fatigue, such as the use of serif type, to direct the eye from one letter to the next throughout the body, and lines of text not longer than 50-53 characters, to reduce eye movement while increasing reading speed. Sans-serif typefaces normally read about 70% slower than serif types, which makes them more tiring for longer text. The optimum line width rule is that a line of text should be no longer than one-and-a-half times (1.5X) the point size of the lowercase alphabet used, regardless of font size. For text comprised of alphabetic letterforms, using a typical serif typeface designed to represent word gestalts and cultural cognates, a font sized approximately 11.25 points is optimal for mental processing of human visual geometry over an extended reading period; however, periodicals often reduce body text size by at least one point due to restricted space. Size and attribute changes should be infrequent to garner maximum style effect. A daunting "wall of text" can be both boring and painful if rests are not interlarded. Reading comfort increases comprehension. See ragged, raster burn, interlaced, MPX, optical center, sequence, legible, type noise, z-path.