The visual limits of “now-you-see-it-now-you-don’t,” yes-no-yes-no, something-nothing-something-nothing, dot-dash-dot-dash are relative size-scale discernibilities spoken of technically as resolution. These resolvability limits of the human eye may be pictured as (in Fig. 100.031.png) follows: The finest “smooth”-surface, intercolor-crossblending, continuum photogravure printing is accomplished with a benday screen that uses 200 unique color dots per square inch of printed surface. (See Secs. 260.11 and 260.22.)