Sometimes we take an imaginary trip after we have traveled on a real trip and all sorts of things happen. Perhaps the importance of the trip has diminished with time. Other times a quickly discarded picture grows stronger on you.
When we are taking a picture, the best thing I can think of would be to let the unexpected happen. Focus on that and let the brain do the rest of the work later. The process of working through the impressions of the things seen, or re-living the magic of the moment is a bit like playing in the sandbox with the sand before building the castle.
Sometimes we have to look twice. Kind of freewheelin’. The eye is eager like the shutter to capture the image we want but also the image we did not want. In the days of the surrealists a wooden leg could become a work of art. so have a look there is no need to connect the dots.