# Podium
> Present a diagram as slides, with chapters, the pan-versus-morph rule, and the presenting keys.
A podium turns a Vellum diagram into a presentation. Each slide is a framed
region of the canvas; presenting pans and zooms between them.
The diagram stays the source. There is no export step, so the deck cannot drift
from the drawing.
## Slides and chapters
A slide is a view of the diagram rather than a copy. Editing the diagram
changes what the slide shows.
A chapter is a diagram tab. Slides belong to a chapter, and the audience walks
one flat sequence across every chapter in order: chapter one's slides, then
chapter two's, and so on. Reordering within a chapter reorders the talk;
reordering the tabs reorders the chapters.
The transition follows that structure:
| Moving | Looks like |
| --- | --- |
| Between slides in one chapter | A pan and zoom across the same canvas |
| Across a chapter boundary | A morph to the next diagram |
Put a change of subject in a new chapter, and keep one argument's slides in one
tab.
## Presenting
Present mode fills the screen. The keys:
| Key | Does |
| --- | --- |
| → / Space | Next slide |
| ← | Previous slide |
| PageDown / PageUp | Next / previous |
| Home / End | First / last slide |
The pill shows the current slide's name, falling back to "Slide *n*" when you
have not named it. The chapter name is in the pill's tooltip rather than on the
pill itself.
The laser pointer (L in the editor) works here too.
## Strata as speaker material
A slide can show the strata attached to shapes in view, as cards beside the
diagram.
## Sharing
A podium is part of its blueprint and inherits its visibility. Anyone who can
read the blueprint can step through the podium.
> [!NOTE]
> The [Podium Recorder extension](/foliums/blueprintr-user-guide/sharing/browser-extension),
> which captures a flow in the browser and turns it into a deck, is on the
> roadmap and not yet installable. Build podiums from the diagram for now.