What hand-building is
Hand-building means making a piece from clay without a wheel: with your fingers, a board and a few wooden tools. It's the oldest way of working with clay and it's still the first one people learn, because it doesn't depend on mastering a machine — it depends on understanding how clay behaves when you squeeze it.
There are three ways of building up a wall, and in the workshop you try all three. Pinching means starting with a ball and opening it up with your thumb until it becomes a bowl. Coils are ropes of clay stacked in a spiral and joined with your fingers: that's what lets you build as high as you like. And slabs mean rolling the clay out like dough and cutting it, which is what gives you straight shapes.
What people take away isn't the technique, which can be explained in twenty minutes: it's finding out that they can do it. Almost everyone arrives convinced they're no good with their hands, and two hours later there's a mug on the table that wasn't there before.

