I wondered that, too. But, maybe we're biased in our thinking by the word "porcelain", which sort of implies dolls or decorative knick-knacks, etc.
What about toilets? Table lamp bodies? Flower vases? Urinals? Garden Gnomes? Lotsa stuff that has some size/weight to it that are made of porcelain, and those spikes look like they were arranged in a pattern. Could have been they were part of a materials handling robot that moved multiples of a substantial product, and those are locating pins designed to pierce the product while it's still greenware, then hold it in place while it's baked. Or, the points are a convenient shape for centering on a hole in the product that may vary in position by some amount.
All I know is you stay away from robots when they're running, no matter how well you think you know their routine. Even the small ones can be freakishly strong little buggers, and they'll win any strength-based fight with a squishy, fragile meat sack.