Volume rendering of the idealized FDM filament sample for m₂₂ = 1 in a periodic, comoving box of L = 2 h⁻¹ Mpc at z = 4, generated by sampling the FMF in Fig. 10 for masses M > 3 × 10⁹ h⁻¹ M_⊙. The same realization is shown from three different viewing angles. The characteristic filament length is ≃1 − 2 h⁻¹ Mpc. The random iid placement of the cylinders neglects any filament-filament cross-correlations encoded in the cosmic web. Consequently, one expects the power spectrum of the box shown to be identical to the one-filament term in Eq. (41). This is supported by Fig. 12 which compares the spectrum of the domain depicted in this Figure (dashed, yellow) with the stacked spectra following from Eq. (41) (solid, blue).