[top]: Matthias Grünewald: "Visit of Saint Anthony to Saint Paul", retinex filtered, vectorized and color desaturated detail from Isenheim altarpiece (1512–1516). Perhaps also elements from the other altarpiece depicting "The Temptation of Saint Anthony" went into Holiday's illustration (see also Mahendra Singh's blog justtheplaceforasnark.blogspot.de/search/label/Matthias%20Gr%C3%BCnewald).

[bottom]: Henry Holiday: from an illustration to the chapter "The Beaver's Lesson" in Lewis Carroll's "The Hunting of the Snark".

2018-12-27: I tweeted my finding to the Musée Unterlinden. And they retweeted it: snrk.de/kitty