Spirals make up the structure of our natural world, from immense galaxies to our own minuscule DNA. Unlike primitive robots with joints attached at right angles and actuators attached in straight lines, our bones, with rounded joints and muscles that wrap around in spirals, move in spirals.
See that figure from the monumental work ANATOMY TRAINS by Thomas Myers? He calls that arrangement of muscles the Spiral Line, where they loop around the body in opposing helices (like our DNA) joining each side of the skull across the back to the opposite shoulder, then around the ribs to cross at the navel to the hip, and so on down to wrap around the foot.
Notice the longer lines of muscles and limbs as you move down the body.
In our Argentine tango embrace the partners connect somewhat like a strong parabolic arch, apart at the ground level, reaching up in a long arc to connect up top.
In my preferred style, Salon Tango, the top connection is quiet and well structured. Part of the magic for me as both observer and dancer is the invisible transmission of information flowing back and forth across that top connection by pressures alone. Then, from our stable “base” up top, our energies spiral downward and outward — tiny movements (secret pressures) up top, large movements down below. Like the shape of a Christmas Tree!
When I am sending the signals of my intention from the pressures of my feet rooted to the floor, spiraling up through my body to my partner connection up top, it accomplishes a couple of things. A sensitive partner can feel my foot placement and pressure distribution, and the mass of the upper body and stable partner connection fine tunes the signal.
The shape of the pressure “envelope” transmits your request for the shape of the response. A slow, light, sustained pressure would call for a cylindrical shape revolving slowly for a sustained time. A fast, sharp pressure would call for flaring out at the bottom. Variations in the Attack-Decay-Sustain-Release pressure, plus up and down pressure modifiers, call for some kind of matching response.
When we receive our partner’s intention pressures we respond by magnifying the invisible signal we receive up top, with movement growing more powerful and bigger as it moves down the body. We, too, firmly root our standing leg to the floor so that our partner can in turn receive pressure information through our body, telling where our foot is and how we are standing on it.
So! Think of your head as a wonderful shining (huge) ornament atop a Christmas tree strung with spirals of beautiful garlands.