Cytosketch provides a tool to add rectangles. To add a rectangle, click the Rectangle Tool and then click and drag on the canvas to draw the rectangle. Keep
pressed to use the tool multiple times.Cytosketch has a special feature to ensure that you always have a good rectangle color for your figure. When the style of the rectangle is set to default, Cytosketch automatically adjusts the color depending on what is underneath the rectangle. If the rectangle is on a dark image then the rectangle will be white, on a light image the rectangle will be black. See below for an example.