View difference between Paste ID: tzUjgJXd and A6CvsZLB

 \documentclass[preview]{standalone}
 
 \usepackage{tikz}
 \usetikzlibrary{calc} %for coordinate calculation
 \usetikzlibrary{math} %for \tikzmath (thanks to /u/tzjin for the LaTeX Challenge Part 2 where I learned about this!)
 
 \begin{document}
 	\begin{tikzpicture}
 		\tikzmath{
 			\N = 30; %the number of lines to draw per side, more is prettier but 30 is a good number for the challenge (I suggest trying 50 or greater)
 			\L = 10; %width of the side, only affects the output size
 			\d = \L/\N; %distance between line connection points (on both horizontal and vertical axes)
 			\lineW = 0.1; %width of the lines, should be small for the best output
 			\lineopac = 1; %opacity of the lines
 		}
 
 		\coordinate (LL) at (0,0); %lower left corner
 		\coordinate (LR) at (\L,0); %lower right corner
 		\coordinate (UR) at (\L,\L); %upper right corner
 		\coordinate (UL) at (0,\L); %upper left corner
 
 		\coordinate (dx) at (\d,0); %for coordinate calculations
 		\coordinate (dy) at (0,\d); %for coordinate calculations
 
 		\foreach \i in {0,...,\N}{
 			\draw[draw opacity = \lineopac, line width = \lineW] ($(UL) - \i*(dy)$) -- ($(LL) + \i*(dx)$);
 			\draw[draw opacity = \lineopac, line width = \lineW] ($(LR) + \i*(dy)$) -- ($(UR) - \i*(dx)$);
 		}
 	\end{tikzpicture}
 \end{document}