Smooth-sliding Whiteboard/Presentation

When preparing a presentation we usually prepare one slide at a time. Why not have a continuous roll of the slide so that you can develop ideas and you can easily roll back? This is not necessary for all types of presentations but for those with graphics or sequences it will be very useful.

The idea can also be used for digital whiteboards. The board would pan sideways to extend (analogous to how a blackboard would roll up and down).

While on this idea, a physical sliding whiteboard can be build that is self-erasing! Cool!