Sometimes prints are layered, and one of the motifs or layers will have one direction and the other(s) will have another. Think of tossed flowers over a plaid background. The final determination, though, is based on the most restrictive directionality. In this print from the collection of mannagryn design on Flickr, the hearts are pointed in two directions but the windows, people, and everything is one-way. So, this would be considered a one-way design.