I take a picture of the item, and any "surrounding context" ... and then as I continue to ride, I "write" the story surrounding that picture in my head.

For example, if I just took the following photo and posted it, it wouldn't mean anything to anyone:



So I also took this photo, which explains what the photo above is all about:




In other cases, I might take a picture of a nearby road sign or something else that will remind me exactly where the photo was taken. And then I might be able to look up whatever it was I saw on the internet and would be able to include some background information in the story if I decide to write it up.