\input lua-visual-debug.sty
\hsize 3in \vsize 3in
\pagewidth 3.2in \pageheight 4in
\hoffset -.9in \voffset -.5in
\centerline{A centered line with \TeX}
\vskip .5in
A wonderful serenity has taken possession of my entire soul, like these sweet
mornings of spring which I enjoy with my whole heart. I am alone, and feel
the charm of existence in this spot, which was created for the bliss of souls
like mine. I am so happy, my dear friend, so absorbed in the exquisite sense
of mere tranquil existence, that I neglect my talents.
$$\int_e^x=mc^2$$
\bye