Function orb_element 

pub fn orb_element(
    state: OrbState,
    size: OrbSize,
    t: f32,
    frame: &Rc<RefCell<Frame>>,
) -> impl IntoElement

Paint one frame of an orb at animation time t (seconds, unbounded) — the pure, host-ticked form of Orb. Build it inside any render that runs on a clock of its own; the reduced-motion convention is t = 0.6.

frame is the caller’s geometry buffer, overwritten here and handed to the paint closure. Geometry is a function of t, so there is nothing to cache between frames — but a host that keeps one buffer per orb reuses its two Vecs forever instead of growing a pair from empty on every tick.