A journey can be in space, or in time, or both. A journey is simply Point A to Point B.
Your collage can be about the whole journey, or just a few moments of it.
Or a portrait of a traveler, or more than one traveler.
Or a map of a journey.
Have fun, my fellow wanderers! Remember the words of J.R.R. Tolkien: "Not all those who wander are lost."