MAME additionally supports artwork files in PNG format for bezel and overlay graphics. A board containing a grid overlay represents the field. Damage displays as a red vignette overlay. These combining characters overlay the preceding character, creating a composite glyph. Visibly this looks like a red colored overlay being added or removed. Interlocking blocks with a stylized Joshua tree design overlay some of the windows. Basically it is density slicing applied to a pseudocolor overlay. Melamine formaldehyde is used in plastic laminate and overlay materials. Alpha channels employed for video overlay also use (conceptually) this palette. For example, contents in hardware overlay are not captured. Sable may overlay any of these colors. Brindles are a striped overlay of the fawn or red. It came with a thin keyboard overlay and a ZX81 manual. Nodes in the overlay network are connected by virtual or logical links. There is an integrated overlay for use in games.