What are the advantage and disadvantage of Potter's wheel
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No sending a portrait in todays world would not mean the same thing. no i don't think that if the president sent his portrait it would reaffirm a relationship. todays perception of authority is anyone who can make a person do something out of force so sending a picture does not come out as authority it comes out as weak and unknowing.

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.