Center. A dot. Nothing else.
First ring. In a mandala, that dot is called the bindu, and everything else in the drawing is understood to radiate from it, the way a room is understood to radiate from a single held breath before anyone speaks.
Second ring. In geometry, a point has position and nothing else: no length, no width, no area, no volume. Euclid needed it as a starting definition, not because a dimensionless mark is a thing you could ever draw with an actual pencil, whose graphite always leaves some smear of width, but because every line, circle, and plane that follows has to be built from something that itself takes up no room. The point is a fiction the whole system depends on.
Third ring. These two dots are not the same claim wearing different clothes. The bindu is a devotional and symbolic center, sometimes described as the point where the manifest world contracts back into unity, approached through attention and stillness rather than measurement. The geometric point is a formal convenience, defined by what it lacks, useful precisely because it refuses to be a shape you could get lost in. It's stipulated by axiom and then never mentioned again once the real work of the diagram begins. Collapsing them into "basically the same idea" would flatten what makes each one work. But sitting them side by side is fair, and maybe instructive: both traditions independently decided that the most powerful place to start is a mark small enough to have no properties of its own.
Fourth ring. What both dots share, even held apart, is what they let happen next. Nothing about a point implies a circle. Radius zero produces nothing you'd call a shape. And yet draw one circle around the bindu, then another wider one, then another, and a mandala assembles itself ring by ring, each layer legible only in relation to the center it never touches again after the first mark. Draw a circle in Euclidean geometry, and the definition itself requires a center point equidistant from every point on the circumference, meaning the circle is, structurally, an argument the point makes about itself, extended outward until it closes. In both cases the emptiest possible object turns out to be the only thing capable of organizing everything drawn around it. A center with content, a center that was already something, would compete with what surrounds it. A center with nothing to it can hold anything without distortion, the way silence can hold any sound that follows it without changing what the sound is.
Fifth ring, outermost. I think this is why both the meditator and the geometer keep returning to the same trick, without either one needing to know about the other's version of it: if you want to build something whole out of many parts, don't start with a part. Start with the place a part could be, before it decides to become one. A dimensionless point cannot be divided, cannot be diminished, cannot be located more precisely than it already is, because it is nothing but location. Everything that gets built outward from it, the rings of a mandala meant to walk the eye back toward stillness, or the theorems of a geometry meant to prove something true about space regardless of where you stand in it, borrows its coherence from that first refusal to take up any room at all. The circle is what the point looks like once it agrees to have consequences. Whether you're sitting in front of one or proving something about the other, the center holds not because it's strong, but because it never had anything to lose in the first place.