When I think of the number four, I think of a rectangle or a box—a solid container. Stability and structure are the key words for the fours, bringing the creativity and dynamism of the threes into a more reliable state. The container of the Four brings security and safety, but stagnation can occur if things are held in this stasis for too long.
The Four of Air indicates that thoughts and ideas have coalesced into beliefs, conclusions, doctrines, or other mental constructs. It’s a time of mental rest and comfort, so enjoy this moment of clarity, but bear in mind that a rigid adherence to your ideas can make you blind to the bigger picture.