The celling and lamps update is an alpha file of the Minecraft resource pack The Backrooms Resource pack, made for Minecraft 1.16.5. It was published on May 9, 2021 and is 12.6 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the The Backrooms Resource pack resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.
