Dimensionality, D, versus inflation, I, plot for particles containing 50 equal-sized constituents for ≈15 000 randomly-generated structures (with φ = 1). The inset box shows the limits on D (1 ≤ D ≤ 3) and I (1 ≤ I ≤ N²/27), and the middle vertical line shows the limit for an idealised 2D particle, i.e., I = N/4.