The Tired Plain by Don Van Vliet

The bra was white and yellow elastic
and held to foam cones
the corners triangular shaped
pyramid
three edges made one point
starfish and embry boards
triple D cupped and poked to a point
the main character was composed into a bow
that broke first in the front
and equal on adjacent sides

American cowboy was approaching on a collision course
-his hands groped outstretched three digits triangular
to the front nail a line was drawn from the middle
finger to the knuckle of the index finger across
the middle finger onto the third –
creating a perfect arrow
with an imaginary point

(before 1970)