The contradictory properties of glass and its beauty have captured the imag
ination of artists in many cultures and throughout history. This article ex
plores the physical dimensions of this medium in art therapy, and specifica
lly analyzes the traits of glass, a neglected material in both art therapy
literature and practice. The article explores technical and psychological a
spects of the use of heated, melted, and stained glass. Several attributes
of the material are given particular consideration. The fragility of glass
is described in terms of opportunities for physical expression of withheld
anger. The transparence, translucence, and reflectance of the material are
discussed from a symbolic perspective, and clinical illustrations are provi
ded. The issue of safety in art therapy glasswork is given special attentio
n.