Figure 7.  Trace fossils (Helminthoidichnites tenuis), positive hyporelief, Lower Cambrian Mickwitzia Sandstone, Västergötland, Sweden. SMNH X3528. 7.4. Specular enhancement; virtual light from NW. Note how, in contrast to the more naturalistic lighting in 7.2 and 7.3, specular enhancement brings out all structures irrespective of their orientation in the bedding plane.