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Please educate me (this is on page 8 and beyond, the map layouts)

1. It seems that the grey sections (ruled at greater than 4") regardless of where the L shape and U shape portion, its considered ruin, and blocks LOS if no one is in the terrain (as in both parties are on opposite sides).
2. It further seems that the blue sections which are 2" or less in height, also follow the same rules since they are ruins, just being a weird less than 2" in height, so completely blocks LOS to a rhino if the rhino is 100% obscured by the outline of the terrain.

All ruins, regardless of height, act the same vs LoS.

Where the height becomes important is in the plunging fire & some unit rules concerning movement.