Most have been so excited to get their discs open they haven't been noticing, but Engadget have spotted something weird on the Wii U's proprietary disc format: the discs' edges are rounded.
Because these are special Nintendo discs, and not DVDs or Blu-Rays, I guess the company needed to do something to differentiate their product, so rounded edges it is.
The effect is described "as if the folks at Nintendo took sandpaper to every edge of every disc, making them all the more friendly to the touch".
Which sure sounds like something Nintendo would do. "There is not enough joy in these discs! Round the edges to create more happiness for the user when they first experience the disc!"