This unique thick glass vase from the North Sea series is designed by A.D. Copier in 1979 at Studio De Oude Horn. From the bottom of the vase a gulf of air bubbles streams upwards. The blue and white core is enclosed by a clear glass overlay. The bottom is signed with diamant pen "AD Copier 791125 Oude Horn". Copier has designed unique glass objects for Studio De Oude Horn from 1978 until 1991. In 1979 Copier mainly worked together with glass blower Piet van Klei.