In the freytag pyramid structure, for a play to grab the audience’s interest, the stage should take place in an interesting or unique way. climax falling action complication exposition

The answer to your question is the Exposition.

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.