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\documentclass{standalone} \usepackage{tikz} \usepackage{dimer} \begin{document} \begin{tikzpicture} \fill[color=gray](1,0.5)--++(1,0)--++(0.5,0.5)--++(-0.5,0.5)--++(-1,0)--++(-0.5,-0.5)--cycle; \draw[line width=15pt,color=gray](1,-2.5)--(1,1); \grid{3}{5}{[color=lightgray](0,-3)} \draw[color=black, line width=5pt](1,0.5)--++(1,0)--++(0.5,0.5)--++(-0.5,0.5)--++(-1,0)--++(-0.5,-0.5)--cycle; \end{tikzpicture} \end{document}