The first occurrence
And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years: Gen 1:14
The primitive root
aleph א = the ox head, thus strength, power, leader
vav ו = the tent peg, thus add, secure, hook
resh ר = the head of man, thus head, first, top, beginning, man
The story: The cattle (aleph) secured (vav) by the man (resh), thus the cognate words are (cattle) pen, stall, as the place men secure their cattle, and also box, as a livestock stall was in a box shape. Boxes are used to organize and store things, so that there is order instead of chaos, and when God created light, He brought what was chaotic into order.