Volcanic glaze bottle - Jay Kvapil I never tire of admiring a design that exudes originality and spirit. Sometimes form alone works a treat, with the right balance and originality. Any added decoration would detract from its pure brilliance. Decorative lines, texture and colour can all contribute to the added illusion of depth and combine to manifest rhythm in the design. Overlapping lines and colours support the perception of depth. Sharp edges in the decoration can flatten the depth, as can a lack of tonal diversity. Decorative additions can clash with the shape of a piece, if the lines