Most decorated bowls keep their ornament on the outer wall and leave the underside plain. This build goes much further: an unfired grey clay bowl covered so densely in relief appliques that even the base, inside the foot ring, carries decoration.
The construction comes across as methodical. The bowl was formed over a slump form, each decorative piece was made with a stamp, and the pieces were attached with slip before all the edges were cut out. Flowers, leaves, ferns and mushrooms appear on the exterior and inside the foot ring. Two details stand out to me. One is the rim, which forms a scalloped contour following the applied floral sprigs and contrasts with the smooth interior. The other is the oval maker's stamp impressed at the center of the base, a signature tucked where only someone lifting the bowl will find it. That placement seems like a lovely touch to me, since the underside is usually the last place anyone thinks to decorate.
One open question remains: asked what the technique is called, the maker said they had no idea. Sprigging done with stamped slab pieces instead of a sprig mold was floated as a possible name, and that label sounds fair to me. The bowl is still unfired at this stage; what is shown is a mid-point rather than a finished piece, which leaves plenty of room for anticipation about how the surfaces will develop from here.