That's a good attempt Rik. I know I am being a bit of a pain here but that is a job for Illustrator CS2 and above using 3D effects onto a circle, saving your squares as a symbol which are drawn straight across the page. Go back into an edit of your 3D sphere and then mapping your squares onto that. You would have to rotate your symbol to achieve the look that you wanted and maybe change the lighting a bit as well but that would be it. Sorry I forgot to mention the stray squares on the R/hand side you could either expand your ribbon effect and scale or shear or just add them on manually using pen tool. I know I am out of order here as the question referred to a Xara drawing but when I see something could be done really easier in another piece of software I would use that.