Galaxy number density contrast δ in 2D bins of photometric redshift vs. RA for uniform randoms (left), the KiDS-1000 bright sample (KiDS-Bright; middle), and relevant clones from 800Ares2 organised randoms (right). Rows display blue (top) and red (bottom) galaxies, according to a boundary at observer-frame u − i = 2.66. We only show galaxies in the range 172 < RA < 205, 2 < Dec < 3 in order to reveal systematic density variations in the data and randoms. Unlike for uniform randoms, the organised randoms can be seen to reproduce the systematic trends in the KiDS-Bright data, namely under-densities over different pointings (e.g., RA = 175.5, 197.5), visible as vertical bands of fainter pixels, and the differential evolution of densities in the samples with redshift, as evidenced by the boxes (highlighting a specific volume with differential density as a function of sample colour) and horizontal lines (dashed lines give the z_phot. corresponding to the 3rd and 97th percentile number counts for uniform randoms, and dotted lines give these for KiDS-Bright data). We elect to display 800Ares2 randoms here for a clearer illustration of the cloning mechanism, which is more subtle in our other favoured randoms (see Sect. 5.3).