Appel was a founding member of the CoBrA movement and shared Dubuffet's embrace of raw, childlike mark making with bold black outlines and vivid fragmented color patches across figurative compositions. His deliberately crude aesthetic and rejection of refined technique mirror the Art Brut energy seen in Le Gommeux.

Jorn created densely worked figurative abstractions using bold contour lines and jarring color juxtapositions that closely echo the visual vocabulary of Le Gommeux. His interest in primitivism, spontaneous mark making, and rejection of high art conventions aligns directly with Dubuffet's Art Brut philosophy.

Penck built his practice around bold black outlines enclosing flat areas of color within schematic figurative forms that share a strong visual kinship with the fragmented interlocking shapes in Le Gommeux. His deliberate rejection of academic refinement in favor of raw, sign like imagery connects deeply with Dubuffet's aesthetic approach.