On each of these dimensions, people encounter the world and shape their attitude out of their particular take on their experience. Their orientation towards the world defines their reality. The four dimensions are interwoven and provide a complex four-dimensional force field for their existence. Individuals are stretched between a positive pole of what they aspire to on each dimension and a negative pole of what they fear. Binswanger proposed the first three of these dimensions from Heidegger's description of "Umwelt" and "Mitwelt" and his further notion of "Eigenwelt". The fourth dimension was added by van Deurzen from Heidegger's description of a spiritual world ("Überwelt") in Heidegger's later work.