\begin{tikzpicture}
	\node (first) at (-1,0) [rectangle,draw] {$\;\; \JW{n} \;\;$};
	\node (second) at (1,0) [rectangle,draw] {$\;\; \JW{n} \;\;$};
	\draw (first.-45) .. controls ++(-60:6mm) and ++(-120:6mm) .. (second.-135);
	\draw (first.-90) .. controls ++(-60:9mm) and ++(-120:9mm) .. (second.-90);
	\draw (first.-135) .. controls ++(-60:12mm) and ++(-120:12mm) .. (second.-45);

\end{tikzpicture}