If you've been following along, you know this is a series. The first post laid out the ground rule I keep repeating: stay within the same supplier when marbling. The second post worked through five combinations across mosaics, stripes, and terrazzo, and ended with a preview of what was coming next: clay as thread. Woven coils. Grids built by crossing vertical and horizontal lines of different bodies.
This post is that follow-up. Everything here is cone 6, and everything below started as small squares and strips laid onto a base slab before assembly, which is really where all of this begins.
Building the pattern
Both checkerboards above are the same idea at different scales. Cut small, roughly even squares from each clay body you're combining, then lay them onto your base slab in an alternating grid before you roll everything down together. The marbled squares on the left mix a few bodies before cutting, so each square carries its own internal pattern in addition to the checkerboard structure around it. It's a good way to add complexity without adding more colors.
Adding speckles
A few people have asked how I get the speckled look in some of these bodies. The answer is Basalt Black medium fine sand, mixed directly into the clay.
Wedge it in gradually and check as you go. How much you add determines how dense the speckling reads once fired: a small amount gives you a scattering of fine dark flecks, and more starts to move the whole surface toward a heavier, grittier look. I'd rather add a little, check, and add more than dump in a full measure and be stuck with it. You don't want to go too crazy here, a little goes further than you'd think.
Drum Mug, checkerboard
Built on the Drum Mug template, this one uses the same small-square checkerboard approach as the layout swatches above, just scaled up and wrapped around a cylindrical form. The blue marbling holds its movement even in small squares, which isn't always guaranteed once you cut a marbled slab down that small.
Tall Mug, grid
This is the second of the "clay as thread" experiments I mentioned in a previous post. Instead of squares, this uses strips: verticals of one body laid down first, then horizontals of another woven across them before the whole thing gets rolled flat. Built on the Tall Mug template from Booklet Nº2, Daily Vessels, the grid translates cleanly onto the curve.
Estela Vase, grid
Same weaving technique as the mug above, but on the Estela Vase template. The taller, straighter walls give the grid more room to read, and the extra vertical stretch during building pulls the lines just slightly, which I think adds to it rather than taking away.
The one that didn't work
This is the piece I want to flag, because not every combination in this series has gone smoothly. This vase pairs 547 Red Sculpture Clay with 112 Brown Speckled Clay, and it cracked.
547 Red Sculpture Clay contains fine and medium grog and is built for low absorption at cone 4 to 6 (cone 6 average shrinkage 10.0%, absorption 0.25%), which makes it a great clay on its own for tile and sculptural work. My guess is that's part of the problem here.
Its grog content and shrinkage behavior are tuned differently than 112 Brown Speckled, and in a pattern like this checkerboard, where you've got dozens of small seams packed close together, even a small mismatch in how two bodies shrink gets multiplied across every joint.
I also suspect I made it worse by rolling the squares a bit thick. In a pattern this dense, thickness matters as much as the clay body itself, more mass at each seam means more material pulling against its neighbor as everything shrinks. Thinner, almost onion-skin layers give each seam less to fight over.
So for now: 547 goes on my list to retest as a base, rolled thinner, and avoid oversized layers. 308 Brooklyn Red stays the safer choice if you want to use red clay as a base.
All together
That's the full range from this round: checkerboards, mosaics, woven grids, and one cracked cautionary tale. Cross-referencing against the first post and the second post, the pattern holds. Staying within a supplier gets you most of the way there, but even within a supplier, pay attention to how each body is formulated. Sculptural clays with heavier grog and stoneware bodies built for plasticity aren't always going to move together, especially in a pattern dense with seams.
More combinations coming. If you want to try any of the forms above yourself, the templates are linked throughout this post.
