1. The landscape of thoughs, a reification of the domain of imaginary entities, memories, feelings, ideas, fears or any other object in the mind, seen together as making up metaphoric features: forests, jungles, deserts, rivers, valleys, cloudy mountains, etc.
2. To mindscape: as to landscape, the careful trimming/shaping of ideas, memories, or other mental objects, as when "mowing the lawn", "planting bushes", and/or maintenance on existing features in the mental world.
Marcel Proust strolled in his mindscapes, to bring us his books "In Search of Lost Time".