The Flow Pottery Sherd is found only inside trial chambers — the underground structures of the Tricky Trials update (Java 1.21, Bedrock 1.21.0), built from copper and tuff and generating in the deepslate layer around y = −40 to −20. It is not obtained by brushing: it is hidden inside the decorated pots that generate in the chambers, and each pot has a 1 in 13 chance (about 7.7%) of holding one — break the pot to collect it. The face shows stylised flowing lines, read as water currents or the wind trails left by the Breeze; the same motif appears on the Flow Banner Pattern and the Flow Armor Trim.

The sherd has no crafting recipe. To use it, place any combination of four sherds or bricks in a 2×2 square on the crafting grid to assemble a Decorated Pot; the first occupied slot sets the front face and the rest run clockwise, so the Flow motif lands on the side matching the sherd's position. A crafted pot drops whole when broken bare-handed or with a Silk Touch tool, and shatters back into its four components when broken with any other tool or a projectile. It has a single inventory slot: hoppers above insert items, hoppers below extract them.