There is an ogham called "Tinne" that is associated with the Holly tree in the Colin Murray system. This ogham is located right in the middle of the fifteen ogham consonants: B-L-F-S-N-H-D-T-C-Q-M-G-nG-Z-R. For this reason, I always tend to associate Tinne with a balance point, a place right in the middle, a location in between.
The equinoxes are a "Tinne" type of event for me. The days and nights are balance across the equator, and I like to believe that there is this fine line, this separate moment at which point all is in balance and then the world either moves towards longer days or longer nights. Wait! It happens at the same time! In addition, as one side moves to greater light and one side moves to greater night, it is done so in balance.
The concept of the Wheel of the Year, while valid for a given location doesn't really seem valid on a global sense. We see the world through a very local lens, but, as modern pagans, we must be cognizant of a more global view. We may have our local Earth Mothers - as our ancestors did - but the Earth Mother extends everywhere. The famous image of the view of the Earth from the Moon really drove this point home. Our Earth is a world in motion.
Since the world is in motion, I do not believe that a two-dimensional wheel properly describes the scenario of the seasons. It isn't just the calendar dates that move; the winds move over the surface of our world; the seasons express themselves in varying and different ways through the crust of the Earth; the waters that travel the surface of our world are always in motion, such as rivers and streams and ocean currents; the still waters, be they lake or pond or bog are also in flux due to evaporation. The waters deep in the Earth, the underground waters that flow as the lifeblood of the Earth Mother, past the Ancestors, through the caverns deep in the Earth, are constantly in motion. The molten core of the Earth is also in motion and moves to points of expression throughout the surface of our world.
I am not sure how one would describe this kind of motion, but it isn't a simple spin of a wheel. It is more like perpetual motion with intent and spirit behind it. It is motion that expresses itself in many ways and in many directions yet, when matched against the calendar, this constancy of motion does move in a linear path through the year with opposite events set apart across the equator. As the days get longer, the nights get equally longer on the other side of the equator until the Sun seems to stop on the Solstices and the motion turns around. The days and nights then move towards a balance which is achieved at the equinoxes and then the cycles continue. Here we have the movement of the various streams over, on, and under the Earth set upon a backdrop of the Earth's own movement through the solar system.
Tinne is the balance point. I like to think that for one brief and fleeting moment, all of the Earth and the seasons are balanced like a cosmic dance which never ends, is always in motion, and pauses just ever so slightly, when music and motion and constancy stop only to enter into motion once again.