Beautiful curved grid?

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Author

OSjerick

Last Updated

10 years ago

License

Creative Commons CC BY 4.0

Abstract

A variant and a combination of Hering's and Zöllner's illusion. The red grid is completely straight all the time.

Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.

Click the Illusions tag below to see more!

Tags

TikZ Optical Illusions

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% Source: http://tex.stackexchange.com/a/150306/23931
\documentclass[border=10pt,tikz]{standalone}
\pagecolor{gray!5}
\begin{document}
    \begin{tikzpicture}[x=4cm,y=4cm,every rectangle node/.style={draw,thick,red,rotate=45,minimum width=0.707*4cm,minimum height=0.707*4cm}]
        \foreach \y in {1,...,3}
            \foreach \x in {1,...,3}{%
                \foreach \diameter in {1,...,6}
                    \draw[gray,thick] (\x,\y) circle (1/12*\diameter);
                \node[rectangle] at (\x,\y) {};
            }
    \end{tikzpicture}
\end{document}