Playback speed
MB3 104b: Watching a Non Jew Make Cheese on Shabbos (307:22); Introduction to Muktzah (308:1)
Supervising a non-Jew making cheese on Shabbos is not problematic since the non-Jew is making the cheese for his own benefit.
The Mishna Brurah's into to hilchot muktzah: Why did chazal institute muktzah on Shabbos? The categories of muktzah:
מוקצה מחמת חסרון כיס, מוקצה מחמת גופו, כלי שמלאכתו לאיסור.
What makes something muktzah machmat chisaron kis?