Blob the Builder (建) and Joan of Arc (ji) want to construct (建) a Go (廴) field in the anthill's bathroom (an4), so they paint the field on the floor using decorator's brushes (聿).
line of business / industry / occupation / job / employment / school studies / enterprise / property / (Buddhism) karma / deed / to engage in / already
I can't help but see a bullfrog in 业. Maud Younger finds that the climate in the elevator's bathroom are perfect for her new business: growing bullfrogs.