Introverts
The absent-minded professor is the typical example of an introverted thinker. An amusing story of the philosopher Schopenhauer illustrates the characteristics well : it is said that he was standing lost in thought in the middle of a flower bed in a city park, when a gardener shouted to know what he was doing, and who did he think he was? ‘Ah!’ said Schopenhauer, ‘if only I knew the answer to that!’