\[ \left[
\begin{array}{ c  |  c  }
  \begin{matrix}
    0 & 1 \\ 1 & 0
  \end{matrix}
  &
  \begin{matrix}
    \text{\Huge $0$}
  \end{matrix}
\\ \hline
  \begin{matrix}
    \text{\Huge $0$}
  \end{matrix}
  &
  \begin{matrix}
    0 & c \\ d & 0
  \end{matrix}
\end{array}
\right] \]