The criss-cross pattern is simply decoration. After mopping the floor nicely, this kind of painting with colored rice powder is still prevailing in Hindu families of S. India. It is called alipana: Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.