On 9/12/2021 6:54 PM, Sylvain Hubert via ntg-context wrote:
> Dear List,
>
> The following code draws a circle at the center of the page, ignoring
> the "shifted" part.
>
> \startuniqueMPgraphic{concept}
> draw fullcircle scaled 1cm shifted (10cm,10cm);
> \stopuniqueMPgraphic
> \defineoverlay[concept][\uniqueMPgraphic{concept}]
> \setupbackgrounds[page][background=concept]
> \starttext
> .
> \stoptext
>
> How should the metapost background figure be positioned correctly?

\startuniqueMPgraphic{concept}
     StartPage;
         draw fullcircle scaled 1cm shifted (10cm,10cm);
         draw Page withpen pencircle scaled 5mm;
     StopPage;
\stopuniqueMPgraphic

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