%-*-tex-*- %boxexample \def\wid{{\tt wd}} \def\hei{{\tt ht}} \def\dpt{{\tt dp}} \def\boxpoint{\setbox2=\hbox{\vrule width 8pt height 3pt depth 5pt} \wd2 =0pt \ht2=0pt \dp2=0pt \hskip -8pt \box2} \setbox4=\hbox{\hei} \def\vbrule{\vrule width 1pt} \def\hbrule{\hrule height 1pt} \setbox0=\hbox to 1.2in{\vbrule$\longleftarrow \hss \wid \hss\longrightarrow$\vbrule} \setbox8=\vbox to 2in{\offinterlineskip\hbox to \wd4{\hss$\uparrow$\hss} \hbox to \wd4{\hss $\Bigg\vert$\hss}\vss \hbox to \wd4{\hss \hei\hss}\vss \hbox to \wd4{\hss $\Bigg\vert$\hss} \hbox to \wd4{\hss$\downarrow$\hss}} \setbox6=\vbox{\hbox to \wd4{\hss$\uparrow$\hss} \hbox to \wd4{\hss \dpt\hss} \hbox to \wd4{\hss$\downarrow$\hss}} \def\boxexample{\bigbreak\line{\hss \vtop{\copy0 \offinterlineskip \smallskip \hbrule \hbox to \wd0{\vbrule height \ht8 \boxpoint \hss \hskip 4pt\copy8 \hss \vbrule height \ht8} \hbrule \hbox to \wd0{\vbrule height \ht6 \hss \copy6 \hss \vbrule height \ht6} \hbrule } \vtop{\hrule height 0pt \vskip 1in \hbox{\qquad \vrule height 6pt width 8pt depth 2pt \quad $\Leftarrow$ Reference Point} \vskip 62pt \hbox{$\Leftarrow$ Baseline}} \hss}\medskip}