For anyone who wants to build this: this farm is directional because the way dark oak trees check for space to grow ([Wiki page](https://minecraft.wiki/w/Dark_oak#planting)). The crying obsidian block needs to be on the South or East corner of the 2×2 dirt square, and have 5 blocks of air below it.
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I first saw this farm in [Rekrap’s video](https://www.youtube.com/watch?v=Rqra35TLaLA&t=1102s). The crane design I referenced: [Planet Minecraft post](https://www.planetminecraft.com/blog/minecraft-crane-tutorial/).
For anyone who wants to build this: this farm is directional because the way dark oak trees check for space to grow ([Wiki page](https://minecraft.wiki/w/Dark_oak#planting)). The crying obsidian block needs to be on the South or East corner of the 2×2 dirt square, and have 5 blocks of air below it.