\documentclass[tikz]{standalone}
\begin{document}
\begin{tikzpicture}
\draw (-6,0)--(6,0);
\clip(-6,0) rectangle (6,6);
\foreach \y in {-6,-5.5,...,6}
\draw[orange] ({\y},0)--({\y+6*tanh(\y)},6);
\end{tikzpicture}
\end{document}
