\begin{frame}{Workflow Between Two Computers}
  \dots to working with yourself:
  \begin{center}
    \begin{tikzpicture}
      \tikzstyle{repository}+=[minimum height=18mm, text width=15mm]
      \tikzstyle{bitbucket}=[draw, thick, fill=blue!20!white, cloud,
        cloud puffs=9, aspect=2]
      \tikzstyle{every path}=[<->, short]

      \node[repository] (a1) at (-2cm, 0cm) {Alice's Desktop};
      \node[repository] (a2) at ( 2cm, 0cm) {Alice's Laptop};
      \node[bitbucket] (b) at (0cm, 4cm) {bitbucket.org};

      \draw[short, <->] (a1) -- (b);
      \draw[short, <->] (a2) -- (b);
    \end{tikzpicture}
  \end{center}
\end{frame}