Oravisto started to work as an actor in the Finnish National Theatre immediately after graduating from theatre school in 1947.
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In the autumn of 2007, he dramatized and directed an explosive production of Väinö Linnas "The Unknown Soldier" at the Finnish National Theatre.
Pori is considered as the home of Finnish-language theatre as the Finnish National Theatre gave its first audition in Pori at the Hotel Otava in 1872.