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Rakugo is one of the traditional Japanese art and storytelling entertainment that became extremely popular during the Edo period (1603-1868).  Rakugo is a rather unique storytelling performance because a storyteller sits on a seat on the stage called “��Ǵdz���” and tells humorous stories without standing up from the seat.  Moreover, the storytellers narrate and play various characters by changing their voice, pitch, tone, facial expressions, and physical movements. 

In the eighteenth and nineteenth centuries, mathematics underwent a vast expansion, into new, exciting, and increasingly counter-intuitive realms. The subject risked mystification and mutual incomprehensibility between experts in different sub-fields. In the first part of the twentieth century, a group of French mathematicians, under the pseudonym Bourbaki, undertook an ultimately successful program to use the foundation of set theory to put all of mathematics onto a common conceptual and logical foundation.