We think we live in a world of the three dimensions of space and the fourth dimension of time. However, there are actually eleven dimensions. The fundamental dimensions are length, breadth, depth, time and consciousness. The higher dimensions are combinations of these fundamental dimensions.
For example, a stick has length, breadth and depth. It is in time and space. Now, if we keep length and breadth and just remove the depth, the stick will be seen, but the hand will pass through the stick. You can also keep the depth and remove the length and breadth. Then nothing will be seen, but the hand will hit something if you try to pass it through.
In this way, there are various combinations leading to the eleven dimensions that make up the universe. When you are in a plane above the four dimensional space time you can currently perceive, you can see these eleven dimensions, you can see Reality as enlightened beings can.
source: Living Enlightenment