When you put sand ladders on the roof (turned) and played in the way shown in the photo, it appears that shadow in the middle
Sorry for my English level, use a translator
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Duplicate of MC-92 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.

What is a sand or sandstone ladder?

Guessing he means "stair"

That makes more sense.