The subject seems to be one of a scholar in an idealized rustic setting (i.e. as fisherman) dreaming of a Daoist paradise, the standard representation of which is a building floating in clouds arising from a plume of vapor. That it is intended as the Daoist Paradise is suggested by the crane with the tally in its mouth, so often associated with this mythical land, as the tally is a reference to immense longevity. See Moss, Graham, Tsang, A Treasury of Chinese Snuff Bottles, Vol. 5, Glass, no. 921, for a bottle with a similar subject. The sea (hai) with a house (wu) and a crane holding a tally (chou) in its beak form a rebus for the expression 'Adding tallies to the immortal's abode above the sea' (haiwu tianchou), a subtle expression used to wish people many happy returns on their birthdays.