Trecena 11 runs from 1 Ozomahtli through 13 Calli, house, its span carrying monkey, grass, reed, jaguar, eagle, vulture, movement, flint, rain, flower and crocodile before closing on the sign that opens Trecena 15 next in the round. Calli, house, is itself one of the four year bearer signs, so this trecena closes on a day sign capable of naming an entire solar year in the 365 day xiuhpohualli, a significance layered atop its ordinary role here as the thirteenth and final day of the monkey week. Past the count's midpoint, this trecena sits within the stretch the tonalpouhque generally treated as easing after the harder run of trecenas six through ten, and its own favourable reading for arts and friendship continues that gentler run into the count's second half.
The patron bird system the Codex Borbonicus assigns to each of the thirteen numbers would have layered its own reading atop each of these thirteen days, a register distinct from both the trecena's overall patron Patecatl and the individual day signs' own characters, giving a diviner three separate sources of information to weigh for any single date falling within this favourable week. The friendly, gathering character the readers found in this trecena's children carries into how the tonalpouhque advised families to raise a monkey week child, encouraging the song and craft the sign favoured while watching for the scattering the readers warned against, since a gift given no direction was, in Nahua thought, as much a waste as a talent never discovered at all.