McCay got "an idea from the "Rarebit Fiend" to please the little folk", and in October 1905 the full-page Sunday strip "Little Nemo in Slumberland" debuted in the "Herald". Considered McCay's masterpiece, its child protagonist had fabulous dreams, interrupted each week with his awakening in the final panel. Nemo's appearance was based on McCay's son Robert. McCay experimented with formal aspects of the comics page: he made inventive use of timing and pacing, the size and shape of panels, perspective, and architectural and other details. The "Herald" was considered to have the highest quality color printing of any newspaper at the time; its printing staff used the Ben Day process for color, and McCay annotated the "Nemo" pages with precise color schemes for the printers.