Pavimental?

Today I passed a council artist creating pre-distorted paintings on the ground that when viewed from the correct spot displays the correct proportions. Very clever.

These were for the Snow Festival at Greenwood Plaza, North Sydney.

I wondered if they could be called murals in light of the derivation of that word. Indeed ground mural is the common term. A painting on any flat surface is regarded as a mural now. Pavimental has zero chance of becoming accepted, too late for that.