In graphic design of printed or displayed materials, where effective communication is the objective, the use of negative space may be crucial. Not only within the typography, but in its placement in relation to the whole. It is the basis of why upper and lower case typography always is more legible than the use of all capital letters. Negative space varies around lower case letters, allowing the human eye to distinguish each word rapidly as one distinctive item, rather than having to parse out what the words are in a string of letters that all present the same overall profile as in all caps. The same judicious use of negative space drives the effectiveness of the entire design. Because of the long history of the use of black ink on white paper, "white space" is the term often used in graphics to identify the same separation.