We moved the coal pan full of ashes at Rebbi’s house on Shabbos: why not muktzeh? Removing what is disgusting from the house. Muktzeh and non-muktzeh items in a vessel – can we move it? Hastening the extinguishing of a flame vs indirectly extinguishing, related to using a Shabbos timer. Folding chair vs. umbrella, Legos vs. Erector Set. Open Chapter 4 with discussion of materials prohibited for insulating the cooking pot.