# Repeating path (twisted pair)

Here you go. (With an explicit picture one can give an explicit answer.)

\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{knots}
\begin{document}
\begin{tikzpicture}[fat line/.style={black, double=#1,double
distance=6pt,looseness=1.2,line cap=round}]
\begin{knot}[%draft mode = crossings, % uncomment to see where the crossings are
clip width = 0,
flip crossing/.list={1,3,5,7,9}]
\path foreach \X in {0,4.5} {foreach \Y in {0.2,-0.2}
{(1.6*\X,\Y) node[draw,fill=orange,inner ysep=1.5pt,inner xsep=8pt,rounded
corners=1.5pt]{}}};
\strand[fat line=white]
plot[domain=0:4.5,samples=251] (1.6*\x,{0.2*cos(\x*360)});
\strand[fat line=green!60!black]
plot[domain=0:4.5,samples=251] (1.6*\x,{-0.2*cos(\x*360)});
\end{knot}
\end{tikzpicture}
\end{document}


Here is a more complicated way with nicer line joins. (I am not implying that it is impossible to have these nice line joins with knots, I am just not versed enough to fix this within the time I have now.)

\documentclass[tikz,border=3mm]{standalone}
\begin{document}
\begin{tikzpicture}[fat line/.style={black, double=#1,double
distance=6pt,looseness=1.2,line cap=round}]
\path foreach \X in {0,4.5} {foreach \Y in {0.2,-0.2}
{(1.6*\X,\Y) node[draw,fill=orange,inner ysep=1.3pt,inner xsep=8pt,rounded
corners=1.5pt]{}}};
\draw[fat line=white]
plot[domain=0:4.5,samples=101,smooth] (1.6*\x,{0.2*cos(\x*360)});
\draw[fat line=green!60!black]
plot[domain=0:4.5,samples=101,smooth] (1.6*\x,{-0.2*cos(\x*360)});
\draw[fat line=white,line cap=butt]
foreach \X in {1,...,4}
{plot[domain=\X-0.4:\X-0.1,samples=7,smooth] (1.6*\x,{0.2*cos(\x*360)})};
\draw[white,line width=6pt]
foreach \X in {1,...,4}
{plot[domain=\X-0.5:\X,samples=11,smooth] (1.6*\x,{0.2*cos(\x*360)})};
\end{tikzpicture}
\end{document}


EDIT: Corrected the line width of the last plot, big thanks to @Symbol 1.

The artefacts visible in Schrödinger's cat are a result of anti-aliasing in the PDF viewer, they aren't present if the PDF is printed. This was investigated in problem with "crop circles" in tikz knot library .

Putting that solution together with this one yields:

\documentclass[tikz,border=3mm]{standalone}
%\url{https://tex.stackexchange.com/q/532840/86}
\usetikzlibrary{knots}

\begin{document}
\begin{tikzpicture}[
basic strand/.style={
double=.,
draw=black,
looseness=1.2,
double distance=6pt,
line cap=round
},
crossing strand/.style={
line width=6.8pt,
only when rendering/.style={%
draw=\pgfinnerstrokecolor,%
line width=6pt,
double=none,
}
}
]
\begin{knot}[%draft mode = crossings, % uncomment to see where the crossings are
clip width = 1,
flip crossing/.list={1,3,5,7,9},
background color=black,
only when rendering/.style={%
basic strand
},%
every intersection/.style={
crossing strand
},
]
\path foreach \X in {0,4.5} {foreach \Y in {0.2,-0.2}
{(1.6*\X,\Y) node[draw,fill=orange,inner ysep=1.5pt,inner xsep=8pt,rounded
corners=1.5pt]{}}};
\strand[white]
plot[domain=0:4.5,samples=251] (1.6*\x,{0.2*cos(\x*360)});
\strand[green!60!black]
plot[domain=0:4.5,samples=251] (1.6*\x,{-0.2*cos(\x*360)});
\end{knot}
\end{tikzpicture}
\end{document}


Alternative solution that avoids knot and foreach.

\documentclass[tikz,border=9]{standalone}
\begin{document}
\tikzset{
fat line/.style={black,double=#1,double distance=6pt,line cap=round}
}
\begin{tikzpicture}
\draw[fat line=white]
plot[domain=0:4.5,samples=101,smooth](1.6*\x,{0.2*cos(\x*360)});
\draw[fat line=green!60!black]
plot[domain=0:4.5,samples=101,smooth](1.6*\x,{-0.2*cos(\x*360)});
% change yellow to white
\draw[fat line=yellow,cap=butt,dash pattern=on20off32,dash phase=-1]
plot[domain=0:4.5,samples=101,smooth](1.6*\x,{0.2*cos(\x*360)});
% un-comment for even better clipping effect
%\draw[white,line width=6,cap=butt,dash pattern=on24off28,dash phase=1]
%   plot[domain=0:4.5,samples=101,smooth](1.6*\x,{0.2*cos(\x*360)});
\end{tikzpicture}
\end{document}


The result of even better clipping effect