LaTeX-examples/documents/GeoTopo/figures/topology-4.tex

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        \draw[blue] (-1.5, -2.3) -- (-1.5, -3);
        \draw[green] (-3,-2) -- (-2,-2) -- (-2, -3);
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    \node[red]    at (3.3,-1) {$V$};
    \node[green]  at (3.3,2) {$U$};
    \node[blue]   at (1.5, 3.2) {$a$};
    \node[purple] at (-0.4, 1.8) {$b$};
    \draw[purple] (-1.5,1.5) -- (1.5,1.5);

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        \node[red] at (-0.5,0.5) {$V$};
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        \draw[red] (-1,0) -- (1,0);
        \draw[red] (0,-1) -- (0,1);
    \end{scope}

    \node[blue]   at (4.5, 1.7) {$a$};
    \node[purple] at (7.5, 1.7) {$b$};
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