The poet has used a conceit where she compares the ‘long-cramped’ branches that have been shuffliffg under the roof to newly discharged patients who look half-dazed as they move towards the hospital doors after long illnesses and wait to get out of the hospital. As, the patients want to get free from the hospital, in the same manner, the trees urge to be free from the prison house. The poet shows like a human, the trees also need freedom and they can achieve it when they are in the forest not in an artificial house.