I teach drawing. I currently use my iPad as a document camera and project image on a screen. I would like to use Portal to display what I'm doing while students sit around the table (instead of a large classroom setting). This would require the "camera" to be focused on my desk rather than toward the room. so in essence, there would be a need for an adaptor camera to be clipped to the side of the screen, facing downwards, while the display screen is a an upright angle for viewing.