Making a pot starts with a lump of clay and ends in a kiln heated to over 1,000°F. Between those two points, the clay is shaped (by hand, on a wheel, or in a mold), slowly dried, and fired at least once to transform it from soft earth into hard ceramic. Humans have been doing this for at least 18,000 years, based on pottery fragments found in a cave in China’s Yangtze River basin. The basic logic hasn’t changed much since then, though the tools certainly have.
Preparing the Clay
Raw clay isn’t ready to use straight from the bag or the ground. It needs to be wedged first, a process that’s essentially aggressive kneading. You cut a chunk of clay in half with a wire, slam the two pieces back together, and repeat. This does three things: it evens out moisture so there are no dry or wet spots, it aligns the clay particles into a uniform structure, and it forces out trapped air pockets. Those air pockets matter more than you’d expect. If air remains inside the clay when it enters a hot kiln, the trapped moisture turns to steam and can crack or even explode the piece.
There are a few wedging styles. Spiral wedging involves rocking the clay forward and backward while rotating it, folding layers into itself in a spiral motion. Ram’s head wedging works similarly but presses with both hands on either side of a clay log, folding it back into itself with each push. Cut wedging, the simplest version, is just the slice-and-slam technique. Most potters use some combination depending on how much clay they’re working with and how consistent they need it to be.
Shaping by Hand
The oldest and most intuitive way to form a pot is by hand, using one of three basic techniques: pinching, coiling, or slab building. Each produces different shapes and suits different purposes.
Pinch Pots
You start with a smooth ball of clay that fits in your palm. Press your thumb into the center, about halfway to the bottom, then slowly rotate the ball while pinching the walls outward between your thumb and fingers. The goal is even thickness all around. This is the most direct method, similar to how Native Americans traditionally shaped clay vessels. It works best for small forms like bowls, cups, and simple rounded shapes.
Coil Building
For larger or taller pieces, potters roll clay into long ropes about a quarter to half inch thick, then stack these coils on top of each other in a spiral. Each new coil gets pressed and smoothed into the one below it. The base is usually a small pinch pot turned upside down to serve as a foot. You can leave the coils visible for a textured, ridged surface, or smooth them together completely for a clean wall. Coil building gives you control over the shape at every level, so it’s well suited for vases, large bowls, and sculptural forms that would be hard to throw on a wheel.
Slab Construction
Slab building works more like carpentry. You roll clay flat between two wooden guide strips (which keep the thickness uniform), then cut the slabs into panels using templates or freehand. To join two edges, you score both surfaces with a pointed tool, wet them, press a thin coil of soft clay along the seam, and push everything together. This is how potters make boxes, angular vases, plates, and anything with flat walls. Slabs can also be draped over bowls, rocks, or plastic forms to create curved shapes. As the clay dries, it shrinks slightly and pulls away from the form while keeping its shape.
Throwing on a Wheel
Wheel throwing is what most people picture when they think of pottery making. A ball of wedged clay gets slammed onto the center of a spinning wheel head, and the potter uses wet hands to pull the clay upward into a cylinder, then shape it outward or inward from there. The key challenge is centering: if the clay isn’t perfectly centered on the wheel, the walls will be uneven and the pot will wobble. This takes practice, often weeks or months of it.
Once centered, the potter opens a hole in the middle by pressing down with their thumbs, then gradually pulls the walls up and thins them out. The wheel’s rotation does much of the work, which is why thrown pots have a characteristic symmetry that’s hard to achieve by hand. Bowls, mugs, plates, and vases are the most common wheel-thrown forms. After the basic shape is done, the pot is cut from the wheel with a wire and set aside to firm up before any trimming or handle attachment happens.
Slip Casting for Mass Production
When factories need hundreds or thousands of identical pieces, they use slip casting. Slip is liquid clay: a powder suspended evenly in water until it reaches a pourable consistency. This mixture gets poured into a hollow plaster mold. The plaster absorbs water from the slip through capillary action, and a layer of firm clay builds up against the mold’s inner surface. The longer the slip sits, the thicker the walls become.
Once the walls reach the desired thickness, the excess slip is poured out and the piece dries inside the mold. When it’s firm enough to hold its shape, it gets removed, cleaned of any seam lines or casting marks, and sent to the kiln. This process has been used for hundreds of years to produce everything from teapots to bathroom fixtures. It’s fast, repeatable, and wastes very little material.
The Drying Stages
A freshly shaped pot can’t go straight into the kiln. It needs to dry slowly and evenly, passing through several distinct stages over days or even weeks depending on size and humidity.
First comes soft leather hard, where the surface loses its wet shine and the clay firms up enough for light trimming, carving, or attaching handles. At leather hard, the piece is strong enough to hold its shape but still moist inside. This is the best window for major alterations: trimming a foot ring on the bottom, cutting out decorative patterns, or joining separate pieces together. Stiff leather hard follows, when the outside feels cool to the touch and nearly dry. The pot is fragile at this point and shouldn’t be handled much.
The final pre-firing stage is bone dry. All moisture is gone. The clay feels chalky, looks pale, and is extremely brittle. A bone-dry pot will shatter if you drop it. But it’s now ready for the kiln.
Firing in a Kiln
Firing is what transforms clay from a fragile, water-soluble material into permanent ceramic. Most pots go through two firings. The first, called bisque firing, heats the bone-dry clay to burn off any remaining water and organic material. This produces a hard but still porous surface that’s ready to accept glaze.
The atmosphere inside the kiln during firing dramatically changes the final result. In an oxidation atmosphere, there’s more oxygen than needed to burn the fuel, which produces bright, clean colors. Electric kilns naturally fire in oxidation. In a reduction atmosphere, there isn’t enough oxygen for complete combustion, so the fire pulls oxygen from the clay and glazes themselves, which shifts colors in unpredictable ways: reds deepen, grays develop character, and iron-bearing clays turn darker. Gas and wood-fired kilns can be manipulated between these atmospheres by adjusting airflow.
The timing of atmosphere changes matters. All clay bodies need a clean oxidation firing while they’re still porous (roughly up to 1,900°F for stoneware) so organic materials can burn away cleanly. After that point, the potter can shift the atmosphere to suit the glazes. Reduction effects on glazes only happen before the glaze melts into glass. Once the glaze surface is fully molten and glossy, the kiln atmosphere can only affect the very surface.
Glazing and Decoration
After bisque firing, most pots get coated with glaze before a second, hotter firing. Glaze is essentially glass modified to melt onto clay. Its three core ingredients each serve a specific purpose. Silica (silicon dioxide) is the glass former, the ingredient that actually becomes a glassy coating. Flux is a chemical added to lower silica’s melting point, since pure silica won’t melt until temperatures far beyond what most kilns can reach. Alumina, usually added in the form of clay, makes the glaze shrink at the same rate as the pot beneath it. Without alumina, the glaze would crack or peel as it cooled because it wouldn’t fit the surface it was bonded to.
Potters apply glaze by dipping, pouring, brushing, or spraying. The bisque-fired surface is porous enough to absorb water from the glaze quickly, leaving a powdery coating on the surface. During the second firing, this powder melts, flows, and fuses into a smooth, glassy layer. The specific combination of flux, colorants (like iron, copper, or cobalt), firing temperature, and kiln atmosphere determines whether the final surface is glossy or matte, blue or brown, speckled or smooth.
Not all pots get glazed. Some are left unglazed for a raw, earthy look. Others are decorated before firing with techniques like carving, stamping, or painting with colored slips (thin liquid clay mixed with pigments). Wood-fired pots sometimes skip glaze entirely and rely on ash from the burning wood to land on the surface and melt into a natural, irregular coating during the firing.