Make a mask....   The mask is 2 parts:- A clear acetate sheet. Something like this.- An adhesive foam sheet. Something like this.I made a photocopy of the app on the iPad screen, attached the photocopy to the foam sheet (watch out for the orientation and the side with adhesive), then punched away with a hollow punch tool like this. Then I attached the punched foam sheet to the acetate sheet.I glued velcro dots at the corners of the iPad and of the mask to keep the mask from moving arou