sentences:  These paintings on the ceiling and walls were in sharp contrast to his Parisian work, and were designed to send a patriotic message.The Lord Mayor's Hall was finished in 1911, and Mucha was able to devote his attention to what he considered his most important work; "The Slav Epic", a series of large painting illustrating the achievements of the Slavic peoples over history.The series had twenty paintings, half devoted to the history of the Czechs, and ten to other Slavic peoples.