Strong evidence for the existence of elongated or filamentary structure in the nearby Universe comes from 2-dimensional galaxy distributions supplemented by redshift information (e.g. Davis et al. 1982). The 2-dimensional distribution of 21,000 galaxies taken from the UGC (Nilson 1973) and the ESO/Uppsala (Lauberts 1982) galaxy catalogues is shown in Figure 1 plotted in supergalactic coordinates. This plot shows galaxies with major axis diameters greater than 1 arcmin measured at a brightness level of 25 mag/arcsec2 in the blue. Galactic obscuration produces the zone of avoidance which passes vertically through Figure 1. The other empty zone is caused by the gap in the catalogues between declinations −17°.5 to −2°.5. The 2-dimensional distribution in Figure 1 gives a strong visual impression of filamentary structure on angular scales up to a radian and more.