Shading refers to depicting depth perception in 3D models or illustrations by varying levels of darkness.
https://en.wikipedia.org/wiki/Shading
Robotics Sword Cave Shading
Because some cyborgs need swords apparently
His face Il visage Face Portrait Shading Brown Nose Pink Peach Petal Ear Head Skin Finger Lip Neck
"For all our failings, despite our limitations and fallibilities, we humans are capable of greatness."
Ichiro the Cyborg Swordsman
Robotics Sword Cave Shading
Because some cyborgs need swords apparently