Posing the Interdimensional Traveler - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 211

Also try to avoid parallel lines. Remember that symmetry can be boring as well as repetition of strictly
vertical and horizontal lines ( Figure 4-36 ). Try to keep lines on a bias to keep the work interesting ( Figure
4-37 ) .
Figure 4-36: Notice how the straight lines here are repetitive and boring.