The physical liquidity and the visual translucency of glass provide a fitting vehicle for echoing water. By employing clear, green and blue colour, small bubbles plus the swirling indented or bass-relief lines the 'water/aquatic' link is unmistakable.

Kiln-cast glass is often multi-staged. Here the coloured glasses, (originally the raw material for eye glass lenses) are first melted in a glass furnace to 1300 centigrade and rolled with various internal patterns into variously-sized 'logs' which are annealed then when cold are cut into discs. Stage two is to lay out the glass discs onto a flatbed of shaped refractory board in the kiln and fired up to 950 centigrade to melt the glasses into 25 mm thick flat sheets. Finally the flat sheets are re-fired over half-cylinder molds to bend them into the final shapes.