Hi there, I would like to create the simplest slides ever. I have done in LaTeX before, but I'm not sure how to do it with ConTeXt. All I want is to be able to center both vertically and horizontally whatever each slide contains and to change background and text colors in an easy manner (something like from now on background is red and text is white). Looking to http://tug.org/pracjourn/2006-2/schmitz/ and http://wiki.contextgarden.net/Presentations, I still have two questions. How can I get every single slide, no matter there is text or images, vertically centered? How can I change background and text colors after a \page? I mean something like: \setuppapersize[S6][S6] \setupcolors[state=start] \setuppagenumber[state=stop] \setupbackgrounds[page][background=color,backgroundcolor=red] \startcolor[white] \starttext Page is red and text is white. \page Page is blue and text is yellow. \page Page is green and text is white. \page Page is white and text is black. \page Page is red and text is white (again). \stoptext I mean, I know how to start, but I don't know how to change after the start. And it would be extremely helpful to change text colors with a switch (if that were possible), not within an environment (mainly because most slides will only contain one of two words). Many thanks for your help, Pablo -- http://www.ousia.tk