Designing your own “dream world” for lack of a better term. Using landscape marks, such as rivers, gardens, mountains, characters and w/e. So that when you end up in the dream, you can rather quickly gain lucidity. All based of the mere fact you designed your dreamland over the past couple weeks on paper and can recognize your lay-out/art work.
(Not saying you end up in a cartoon world, think “Lay-out” not “crayola colored trees”)