An art movement, primarily in painting, that originated in the US in the 1940s and remained strong through the 50's. Artists working on many different styles emphasized spontaneous expression in large paintings that were abstract and nonrepresentational is called

Photography has changed its subject matter quite a lot over the past few years. in the 1800's, it was considered normal for families to have  post mortem photos of their loved ones, and now that would be completely unacceptable. i think that photographers have always pushed boundaries and have been eager to capture everything, it is just society that changes their boundaries.

The term is called adduction