You find more about floats ([[Floating Objects]]) in the manual.
== Floating graphics with an enlarged, shaded background ==
To place a figure in, say, the right margin with a shaded background that is slightly larger than the figure (to give a bit of breathing room):
<texcode>
\setupcolors[state=start]
\placefigure[right,high,none]{}{\framed[frame=on, offset=10pt, framecolor=lightgray,
background=color, backgroundcolor=lightgray]%
{\externalfigure[sample/cow.pdf][scale=500]}}
\input knuth
</texcode>
== Movies ==