The daybed, ta, is alternatively known by the charming term dushui, literally, 'single sleep.' However, this form could also provide intimate seating for two, in which case separate small mats were used to define seating areas.
Compare a similar huanghuali bamboo-style daybed illustrated in the Nicholas Grindley, exhibition catalogue, New York, March 1999, no.8. A similar zitan example is illustrated by R.H. Ellsworth, et al., Chinese Furniture: One Hundred Examples from the Raymond and Mimi Hung Collection, p. 104-105, no. 32.
For uses of the daybed as indoor and outdoor seating during the Ming period, see Wang Shixiang and C. Evarts, Masterpieces from the Museum of Classical Chinese Furniture, Chicago, 1995, p. 6. See, also, S. Handler, "Life on a Platform," Austere Luminosity of Chinese Classical Furniture, Berkeley, 2001, ch. 8, pp. 105-121.