Brachlow’s new forms, developed during her residency at the Australian National University in Canberra in January 2015, are based on a concept called “D-form”. A three-dimensional form is created by joining the edges of two flat shapes with the same perimeter length. Results are wildly different depending on at which point the shapes are joined. The resulting curved forms are a departure from Brachlow’s previous severe geometric shapes, the surface curvature promoting optical effects such as distortion, illusion and magnification. The continuing aim is an exploration of the interaction of colour, form and light in glass solids: variations in hue and value depending on the form, reflections and distortion depending on surface finish and form, changes in different types of illumination depending on the composition of the glass.