Why did he need to imagine oil to make plastic, though? He created a giant machine out of what I assumed was dirt on his rented plot of land. The machine probably needed petroleum products like synthetic rubber, grease and lubricants, gear and hydraulic fluid? I thought he just turned dirt into whatever he wanted with alchemy. Oh well, I've been complaining about the story in every chapter. I'll stop thinking and hope the dryads are cute enough to carry the story.