Many people engage the physical senses and experience two dimensional worlds. You may sense gaps between things but not physically see them and therefore deduce you are imagning it. Yet, are you really?
Nobody can tell you what reality is. You have to find courage to go and look for yourself. One aligns with innerspace, hyperspace or other worlds based on a willingness to explore gaps in space or understanding.
Rest assured, other dimensions extend to eternity. Many are holographic and multi-directional. The nature of layers of the inner and outer Matrix reveal themselves as one dematerializes the importance of ego. Choose to journey to that point inside self where you realize the real you is spirit rather than ego. Be free.