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defaulWallcolor→GrayLevel[0] is an option for visualization.

The value of defaulWallColor defines the default color for displaying the wall (border) of a cell.

This option is only used for cell walls that are not assigned a value by cellWallColors.

The value of defaulWallColor should be a standard color specification such as Hue[], RGBColor[], CMYKColor[], or GrayLevel[].