x1 stands [is vertically oriented] on surface x2 supported by limbs/support/pedestal x3.
x1 is standing; x1 stands up; x1 is erect/vertical/upright; x1 bows/bends over (= krosa'i, krosa'ibi'o, plosa'i); frame of reference is (approximate) perpendicularity to the surface, and not to a gravity field. See also kamju, sraji, tuple, zbepi, sarji.