Should this list now include <a href="/wiki/Immaterial_Material" title="Immaterial Material"><img alt="" src="/w/images/thumb/7/71/Black.png/20px-Black.png" decoding="async" width="20" height="26" srcset="/w/images/thumb/7/71/Black.png/30px-Black.png 1.5x, /w/images/thumb/7/71/Black.png/40px-Black.png 2x" /></a> <a href="/wiki/Immaterial_Material" title="Immaterial Material">Immaterial Material</a>?

(although it would require a sourcing category of its own)