On 2013–02–19 Kumar Appaiah wrote:

> I am making a presentation that involves some simple animations. The
> way I make those animations is by:
> 
> 1. Stopping page numbering.
> 2. Flipping through the same slide repeated, but with img0, img1, img2 etc.
> 3. Start page numbering.
> 
> The problem with my naïve approach of repeating slides is that fixing
> a spelling error or making changes implies that I have to do it several
> times for an “animated” slide, and is error-prone.

You could use buffers:

\newdimen\cnt
\starttext

\startbuffer [greenbar]
  \blackrule[width=4cm, height=5mm, color=green]
\stopbuffer

\dorecurse{10}{%%
  \blackrule[width=\textwidth]
  \advance\cnt1cm \hskip\cnt
  \getbuffer[greenbar]\page}

\stoptext

Marco