One thing I'd add about the article: naming a function "move" and then having it return the sum of two vectors is bizarre and worse than the original implementa

One thing I'd add about the article: naming a function "move" and then having it return the sum of two vectors is bizarre and worse than the original implementation. At least, move as part of the Point class actually moved the point. This makes sense in MVC where the controller is responsible for updating point coordinates and the view is responsible the actual rendering of the points on the display. Also, in most graphic systems, the screen refresh is done by a single call made from within the interaction loop or by a designated callback. That's because all display updates are made to a back buffer, which then gets written to the framebuffer at a regular clock-driven interval.