|Select Back|: turns off all selected objects except the backmost — use it to setup a blend.
|Select Front|: turns off all selected objects except the frontmost — use it to setup a blend.
|Blend Other HSB|: blends colors as hue, saturation, and brightness. Hue is blended counter-clockwise (on color palette) on objects from back-to-front.
|Blend Clockwise HSB|: blends colors as hue, saturation, and brightness. Hue is blended clockwise (on color palette) on objects from back-to-front.
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|All of Above|: blends colors, patterns, and thickness between frontmost and backmost objects.
|Thickness|: blends the thickness of the pen for lines or borders.
|Patterns|: blends the pen or fill patterns.
|Colors|: blends the red, green and blue components of color.