Fig. 3. The local ordering of the experimentally obtained spinner lattices.

(A) A dynamic lattice formed from spinners at f_H = 45 Hz and ρ = 0.0164 σ⁻². Voronoi diagram is overlaid with the observed lattice. The spinners are blurred because of the long exposure time that enabled precise identification of the rotational axes for all spinners. Scale bar, 1 mm. (B) The probability distribution of the hexagonal bond-orientational order parameter ∣ψ₆∣ in the spinner lattices at f_H = 45 Hz as a function of ρ. (C) The mean ψ₆ value of the spinner lattices illustrates the liquid-to-crystalline dynamic phase transition with the spinner density ρ.