Windows
Yellow Dirty Drapes, Right Half Top
A cloth stable block with 5 hit points.
Changes into
When its hit points run out it becomes 
Curtain Rod.
Drops when destroyed
Cloth Fragment× 1-3
Where to find (3 POIs)
Huenink Family Farms (tier 2), Ruined Residence, Yolk River Ranch.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.