\switchtobodyfont[small]
\setuptolerance[tolerant,stretch]


\definecolumnset[threecolumns][n=3]

\setupcolumnset[threecolumns][1,2][balance=yes]

\definecolumnsetspan[spantwo][n=2]
\definecolumnsetspan[spanthree][n=3]

\definecolumnsethsize{threecolumns}{1}{1}\One
\definecolumnsethsize{threecolumns}{1}{2}\Two
\definecolumnsethsize{threecolumns}{1}{3}\Three


\starttext
\showframe
\startcolumnset[threecolumns]

\setupcaption[figure][location={high,right},width=\dimexpr\One]
%\setupfloat[figure][location=left]

\null
\page[yes]

%\startcolumnsetspan[spanthree]
\placefigure[right][]
{\input ward}%
{\externalfigure[cow.pdf][width=.95\dimexpr\Two,frame=on]}
%\stopcolumnsetspan

\input tufte\column
\input knuth\column
\input zapf



\stopcolumnset
\stoptext