Hi all, After several trial-error experiments, I obtained what I want with the attached code. I use only one background for the frames within definesymbol because the use of several background "failed" (only the last one is eventually displayed). Now, I would like to know if it is possible to obtain a deterministic random-like shapes, i.e. to get always the same shape for Overlay1... Renaud PS: Thanks to Peter, Andrea and Hans for the thread absolute positioning of figures ;) \setupcolors[state=start] \usemodule[pre-original] \defineoverlay[FunnyFrame][\useMPgraphic{FunnyFrame}] \defineframedtext[FunnyText][frame=off,background=FunnyFrame] \def\StartFrame{\startFunnyText} \def\StopFrame {\stopFunnyText } \def\FrameTitle#1% {\setMPtext{FunnyFrame}{\hbox spread 1em{\hss\strut#1\hss}}} \setMPtext{FunnyFrame}{\hbox spread 1em{\hss\strut{TEST}\hss}} % initialize the text variable \startuseMPgraphic{FunnyFrame} picture p ; numeric o ; path a, b ; pair c ; p := textext.rt(\MPstring{FunnyFrame}) ; a := unitsquare xyscaled(OverlayWidth,OverlayHeight) ; o := BodyFontSize ; p := p shifted (2o,OverlayHeight-ypart center p) ; drawoptions (withpen pencircle scaled 1pt withcolor .625red) ; b := a randomized (o/2) ; fill b withcolor .85white ; draw b ; c := center p ; c := b intersectionpoint (c shifted (0,-o)--c shifted(0,o)) ; p := p shifted (c-center p) ; b := (boundingbox p) randomized (o/8) ; fill b withcolor .85white ; draw b ; draw p withcolor black; setbounds currentpicture to a ; \stopuseMPgraphic \starttext \Topic{Stacks \& Layers} \startbuffer[buf1] \FrameTitle{Overlay1} \StartFrame[width=.75\textwidth] This is the first funny frame ! \StopFrame \stopbuffer \startbuffer[buf2] \FrameTitle{Overlay2} \StartFrame[width=.75\textwidth] This is the second funny frame ! \StopFrame \stopbuffer \startbuffer[buf3] \FrameTitle{Overlay3} \StartFrame[width=.75\textwidth] This is the third funny frame ! \StopFrame \stopbuffer \definelayer[layer1][] \definelayer[layer2][] \definelayer[layer3][] \setlayer[layer1][x=.05\textwidth,y=.05\textheight,location=br]{\getbuffer[buf1]} \setlayer[layer2][x=.05\textwidth,y=.05\textheight,location=br]{\getbuffer[buf1]} \setlayer[layer2][x=.1\textwidth,y=.1\textheight,location=br]{\getbuffer[buf2]} \setlayer[layer3][x=.05\textwidth,y=.05\textheight,location=br]{\getbuffer[buf1]} \setlayer[layer3][x=.1\textwidth,y=.1\textheight,location=br]{\getbuffer[buf2]} \setlayer[layer3][x=.15\textwidth,y=.15\textheight,location=br]{\getbuffer[buf3]} \defineoverlay[overlay1][{\placelayer[layer1]}] \defineoverlay[overlay2][{\placelayer[layer2]}] \defineoverlay[overlay3][{\placelayer[layer3]}] \definesymbol[one][{\framed[width=\textwidth,height=.3\textheight,background=overlay1,frame=off]{}}] \definesymbol[two][{\framed[width=\textwidth,height=.3\textheight,background=overlay2, align=right,frame=off]{}}] \definesymbol[three][{\framed[width=\textwidth,height=.3\textheight,background=overlay3, align=right,frame=off]{}}] \definefieldstack[sequence][one,two,three][height=fit,width=fit,frame=off,offset=overlay,clickin=JS(Walk_Field{sequence})] {{\fieldstack[sequence]}} \goto{next}[JS(Walk_Field{sequence})] \stoptext