{spaced-vbox
    width=5in,
    height=2in,
    background="silver",
    {paragraph The following is a red {monospace hrule}},
    {hrule color="red"},

    {paragraph The following is an {monospace hrule} that has
        its height option set.},
    {hrule height=4pt},

    {paragraph The following is an {monospace hrule} that has
        its width, height, and color options set.},
    {hrule width=1in, height=4pt, color="yellow"},

    {paragraph The following is a centered {monospace hrule} that has
        its width, height, and color options set.},
    {center {hrule width=1in, height=4pt, color="blue"}}
}