[013 소파 문제] 팽이대학교 수학과

   \begin{tikzpicture}
      \draw [line width=1.3](0,0)|-(3,3);
      \draw  [line width=1.3](1,0)|-(3,2);
      \filldraw [fill=orange!30!black,rotate around={-27:(1.2,1.6)}](0.2,1) rectangle (0.8,2.5);
      \draw  [->,line width=4.3](0.5,0)--(0.5,1);
      \draw  [->,line width=4.3](1.5,2.5)--(3,2.5);
      \draw [line width=0.3](3,3)|-(4,3);
      \draw [line width=0.3](3,2)|-(4,2);
      \draw [<->,line width=0.3](3.5,2)|-(3.5,3);
      \node at (3.5,2.5)[right]{$1$};
    \end{tikzpicture}