Remember when we used to switch resolutions on our computers? No, probably not. That’s because only old people experienced the pain of doing such a thing manually – these days our monitors are built in to our computers, and the pixel-mapping is done by the OS.
Unless you have a new Retina MacBook Pro that is. Now there might actually be a reason to switch resolutions. But who wants to dig around in System Preferences? Instead, you can use Pupil.