I need help getting info on 60's present modern American theater

As the 1960’s dawned, theater companies in Eastern Europe used their stages to comment on political repression. From Czechoslovakia and Poland came the voices of Josef Svoboda, Václav Havel, and Jerzy Grotowski, using theater to question the harsh realities of life and forge new relationships between actor and audience

the above mentioned statements talks about the creativity of an artist and to what extend they can utilize and experiment on the objects provided.   differing size and subjects are given so that an image of wisdom is created. displaying a transition from light to dark in something by darkening sections in order to create a shadow. and lastly, putting bits and pieces together to formulate a new image.