<Li> Between World War I and II </Li> <Ul> <Li> Ballet </Li> <Li> Economics </Li> <Li> Music </Li> </Ul> <Ul> <Li> Philosophy </Li> </Ul> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr>

Which of the following is not an idea from the enlightment