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If a lower-index background-priority (1) sprite's opaque pixel intersects with a higher-index foreground-priority (0) sprite's opaque pixel, and the screen bitmap has a foreground color at that same position, then the screen bitmap's foreground color is visible. This is counter-intuitive, as higher-index sprite's pixel alone would mask the bitmap color, and adding another sprite top of it makes the bitmap visible again, but this is how the VICII works.