4D Movement: Introducing 'In' and 'Out' as the Missing Directions

This theory proposes that each new spatial dimension introduces two additional directions of movement. In the case of the fourth dimension, the directions “in” and “out” are proposed as the missing vectors. The paper explores dimensional symmetry, limitations of 2D/3D perception, and possible evidence in physics such as quantum tunneling and entanglement. It offers a new way to think about spatial expansion and higher-dimensional motion.