I do consider my glass panels as being paintings. Or at least when I work on the layout I think about it in the vocabulary of a painting. Instead of paint I use float-glass that I cut, break and glue on a wooden panel. Therefore it also gets a 3D aspect, not only for the outer dimensions but due to its transparency also the inside space of the glass mass. A change in direction or intensity of light, or in your own point of view, also changes the appearance of the work, sometimes radically.
In mine opinion the essence of glass is most strongly revealed in its fracture, hard, sharp and sparkling. This expressive side of the glass I use for my art work. With the unexpected beauty of this mundane material I make objects with a well difined disign but have many faces.