\documentclass{ppex}
\nonstopmode
\usepackage {mfpic,ifthen}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {mfpic,ifthen}
\begin{mfpic}[1.5]{-40}{50}{-48}{50}
\newcounter{mfcntA}
\newcounter{mfcntB}
\setcounter{mfcntA}{50}
\setcounter{mfcntB}{48}
\whiledo{\themfcntA>1}{%
 \expandafter\curve{(\themfcntA,0),
   (0,\themfcntA),
   (-\themfcntA,0),
   (0,-\themfcntB),
   (\themfcntB,0)}
  \addtocounter{mfcntA}{-2}%
  \addtocounter{mfcntB}{-2}%
}
\end{mfpic}
\end{document}

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