CLEAR VASE WITH FOUR HOLES, 1999

cf. W. Warmus, Frantisek Vízner: Sklo/Glass 1951-2001, New York, 2001, no. IV-75 for a similar example;
K. Holesovsky and F. Vízner, Sklo=Glass, Prague, 1994, fig. 36 for a similar example.