The novel puts propriety under the microscope, allowing readers to come to their own conclusions about deadening conformity and hypocrisy. Tave points out that while Austen affirms those like Fanny who come to understand propriety at its deeper and more humane levels, she mocks mercilessly those like Mrs. Norris who cling to an outward propriety, often self-righteously and without understanding. Early in the novel when Sir Thomas leaves for Antigua, Maria and Julia sigh with relief, released from their father's demands for propriety, even though they have no particular rebellion in mind. Decline sets in at Sotherton with a symbolic rebellion at the ha-ha. It is followed later by the morally ambiguous rebellion of play-acting with "Lovers' Vows", its impropriety unmasked by Sir Thomas's unexpected return. Both these events are a precursor to Maria's later adultery and Julia's elopement.