The original negative for my photo is 6x9 and I don't have a negative carrier that size for my enlarger (Omega D2), so I cut one out of matboard. I figured as long as I was at it, I might as well make it look rough! If I'd enlarged a bit bigger, my Speed EZ-EL could have made more conventional lower edges, but to me, the irregularity makes the saturated bottom corners as ephemeral as the pyramid itself aiming for the heavens.