The square is when planets or angles, are in aspect of roughly 90 degrees, a quarter of the circle from each other. The term describing the square is challenge. The reasoning behind this is that placements with these 90 degree relationships will be signs and elements that do not easily combine. They challenge one another. They do not easily blend. The challenge comes in with the fact that in order to progress one must work to overcome this disruption.
A chart full of trines (ease) and sextiles (opportunity) can chug along merrily without conflict but it is conflict experienced and addressed that moves us forward. A life without conflict is like a story without a twist, easy but unsatisfying. Growth requires stretching oneself. Without conflict or challenge there is little impetus to move beyond what is comfortable and make gains which benefit ourselves and ultimately others. Squares present challenges to overcome.
Without challenge, why learn? Without adversity how do we refine our character? Life without conflict is boring. Untested character is without opportunity to accommodate. Working a square gives us experience in problem solving, which in turn makes us better problem solvers, ready for the next challenge. Into every life a little rain must fall. I’ve heard that turkeys will stand in the rain till they drown. Whether true or not, I suppose integrating the energies of a square is a bit like teaching a cartoon turkey to use an umbrella, difficult, weird, but helpful.
Do you have squares in your chart? Have you found ways to effectively blend those energies?