turn the canvas upside down for a couple weeks, although maybe it's a good comment on the current resolution of everyone's screen,
maybe you should have made the square area 1280 x 800, or sum such thing, instead of a square, coz we don't have square screens, so whats the point?
most images are going to the top left
since the question involves making a placement within a frame, http://www.blifaloo.com/info/lies_eyes.php
you could derail this somewhat by calling a rotation method, or an inversion/transformation
but maybe imbalance is better than proportionist ideals, but
if it's permanently on display online who says there's a right way up?