a hundred flowers bloom, a hundred schools of thought contend (idiom); refers to the classical philosophic schools of the Warring States period 475-221 BC, but adopted for Mao's campaign of 1956
trad. 百花齊放,百家爭鳴
Also written 百花齊放,百家爭鳴【bǎi huā qí fàng , bǎi jiā zhēng míng】