tartu, estonia's second—largest city.ert's been painted dot by dot, and i've been promised i too can achieve artistic genius with the right tools. believe it or not, these pictures have all been painted with spray paint. they've been pieced together splodge by splodge by the sprayprinter device. my daughter wanted a unicorn on her wall, but i couldn't draw. so that pushed me towards creating this device. to make these magical masterpieces you need the right kit — a smartphone with the appropriate app installed, an external battery pack to keep it fullyjuiced, a tripod to hold it steady, some paint, and of course the sprayprinter. first you select an image and align it against the area you want to paint. so the image is projected like a giant virtual sticker. portraits with shadows work best. the phone's camera exposes for the led on the device, and when it illuminates, it sends the can's location to the app. the phone then tells the printer its coordinates and the printer decides when to spray and when not to. once you ge