From 1969 to 2019, the constitutional landscape of East Asia (including Southeast Asia) has changed beyond recognition. It was impossible for anyone living in 1969 in East Asia to predict what the constitutional and political system in a particular jurisdiction would look like in 2019. For us today, looking at the next 50 years, or even just looking towards 2047, the future is equally unpredictable and uncertain. At the lecture on 15 March 2019, Albert H Y Chen, Cheng Chan Lan Yue Professor in Constitutional Law gave an overview of the constitutional changes in five East Asian jurisdictions, namely Hong Kong, Taiwan, Thailand, Korea and Indonesia. He continued to explore if any “long-term rationality” could be found in the last five decades of East Asian constitutional history, and shared his thoughts on whether the project of constitutionalism that originated in 18th century- Europe and North America has made any progress in East Asia in the last five decades.