\rotatebox{180}{
\begin{tikzpicture}[baseline=1ex]
\foreach \x / \label in {0/left, 1.5/middle, 3/right} {
	\node(\label)[fill=white,draw,rectangle] at (\x,0) {\rotatebox{180}{$\JW{2}$}};
}
% now the shading
\begin{pgfonlayer}{background} 
\draw[fill=black!20]
	($(left.250)+(0,-0.5)$) -- (left.110) to [bend left=90] (right.70) -- ($(right.290)+(0,-0.5)$)
	($(right.250)+(0,-0.5)$) -- (right.110) to [bend right=90] (middle.70) -- ($(middle.290)+(0,-0.5)$)
	($(middle.250)+(0,-0.5)$) -- (middle.110) to [bend right=90] (left.70) -- ($(left.290)+(0,-0.5)$);
\end{pgfonlayer}
\end{tikzpicture}
}