Dummy text is also used to demonstrate the appearance of different
typefaces and layouts, and in general the content of dummy text is nonsensical. Due to its
widespread use as filler text for layouts, non-readability is of great importance: human
perception is tuned to recognize certain patterns and repetitions in texts. If the distribution
of letters and 'words' is random, the reader will not be distracted from making a neutral
judgement on the visual impact and readability of the typefaces (typography), or the
distribution of text on the page (layout or type area). For this reason, dummy text usually
consists of a more or less random series of words or syllables. This prevents repetitive
patterns from impairing the overall visual impression and facilitates the comparison of
different typefaces. Furthermore, it is advantageous when the dummy text is relatively realistic
so that the layout impression of the final publication is not compromised.