Images for documentation examples

ConTeXt users tend to use the famous Dutch cow as a place holder image for documentation examples. At times, it gets annoying. One alternative is to use random figures:

\useMPlibrary[dum]

\starttext
  \placefigure[left,none]{}
    {\externalfigure[whatever][width=0.5\textwidth, height=0.3\textheight]}
  \input knuth
\stoptext

which gives an image as shown below:

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