For spikes appear to be immaterial: every spike has a material “host” (the stuff around it, such as the edible part of a donut) and it may have a material “gues

For spikes appear to be immaterial: every spike has a material “host” (the stuff around it, such as the edible part of a donut) and it may have a material “guest” (such as the liquid filling a cavity), but the spike itself does not seem to be made of matter. Indeed, spikes seem to be made of nothing, if anything is. And this gives rise to a number of conundrums. The immaterial claim for "holes", doesn't hold up with for "spikes". It's getting at something specific, though broad.