62f31996_L_View_Graphics___Face_Effects__Description
[Effect] grid [Arguments] pair! pair! tuple! integer! pair! [Description] 
Generate a two dimensional grid of lines. This is a useful backdrop for graphical layout programs. The optional arguments are: a pair! that specifies the horizontal and vertical spacing of the grid lines, a pair! that specifies the offset of the first lines, a pair! that indicates the thickness of the horizontal and vertical lines, and a tuple! that provides the color of the lines.
REBOL/View Graphics - Face Effects
Description