\begin{exercice}\label{patroncroixversperspective}
\vspace{-1em}
\begin{center}
\begin{tikzpicture}[general, scale=0.75]
 \draw (0,0)--(8,0)--(8,2)--(0,2)-- cycle;
 \draw (2,-2)--(4,-2)--(4,4)--(2,4)--cycle;
\draw (6,0)--(6,2);
\draw (1,1) node {{\LARGE \boldmath $\forall$}};
\draw (3,1) node {{\LARGE \boldmath $\varnothing$}};
\draw (3,-1) node {{\LARGE \boldmath $\exists$}};
\draw (3,3) node {{\LARGE \boldmath $\infty$}};
\draw (5,1) node {{\LARGE \boldmath $\nabla$}};
\draw (7,1) node {{\LARGE \boldmath $\partial$}};
\end{tikzpicture}
\end{center}

\end{exercice}
