https://ctan.fisiquimicamente.com/graphics/pstricks/contrib/pst-chladni/dvips/
Index of /graphics/pstricks/contrib/pst-chladni/dvips/
indexgraphicspstrickscontribchladni
https://people.sc.fsu.edu/~jburkardt/m_src/chladni_figures_test/chladni_figures_test.html
chladni_figures_test
chladni figurestest