My opinion is that these values are completely inherited from setupalign, so you can observe their differences through the following examples: \starttext\showgrid \framed[height=2\baselineskip]{Thus,} \blank[2*line] \framed[align=high,height=2\baselineskip]{Thus,}\blank[2*line]% Similar to \vbox to 2\baselineskip{something\par\vfill} \framed[align=low,height=2\baselineskip]{Thus,}% % Similar to \vbox to 2\baselineskip{\par\vfill\par something} \stoptext It should be because of the existence of vfill, so it is said "move down". When low used with left/right, it will be aligned down on the current line. When low used with page, it will go down to the current page. Left/Right and so on should be the value of location, which determines the relative position of the floats. autumnus