Watching a 3D movie, any audience member is going to be tempted to either remove or slide their glasses up at any point during the film.
Backgrounds also get a pretty big dose of blurred wonder, showing just how much manipulation is used to make the film as 3D as it possibly could be.
Dumbo uses this blur to full effect, with even the closest of closeups taking on nuanced degrees of distortion, with only seconds long moments of 2D appearance in order to help anchor the elements of a particular scene.
Whether it’s to give your eyes a break, or to see the historic blur that’s always been a part of 3D presentations, you’ll notice that in fact the image in front of you is blurred to varied degrees.