Dreaming in Light

Through heat, time, and gravity, glass transforms beyond its original form, and fulfills dreams

Lighting Craft & Tradition 6. 10. 2026

About

Dreaming in Light

In dreams, the ordinary rules no longer apply. Boundaries dissolve, forms become fluid and possibilities expand. Dreaming in Light is an exploration of what happens when glass is approached with the same freedom of imagination.

It all starts with glass that dreams to be more than just flat and clear. Through fusing and slumping techniques that reshape glass through heat, time, and gravity, Preciosa offers designers a tool that behaves more like imagination than raw material.

Glass moves beyond its original form to reveal unexpected textures, depth, colours, and shapes. Glass ceases to just carry light, but choreographs it.

Dreaming in Light is an invitation for you to dream what your next project could look like. Because the most inspiring ideas begin with possibility, not limitation.

Video

Watch the dreaming come true in our video

Gallery

Photogallery of glass transformation

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Gallery

Technology & Craft

Fusing & Slumping

FUSING: Joining pieces of glass together

Fused glass is processed at 750–900 °C, allowing individual pieces to bond into a single form. By adjusting temperature and dwell time, different effects emerge— from lightly textured edges to softened shapes and fully smooth, flowing surfaces.

FUSING: Bubble formation & colour blending

During fusing, bubbles can form between glass pieces. Their size depends on temperature, dwell time, and shard size: larger pieces create bigger bubbles, while smaller ones produce fine textures. Mixing shard sizes adds variety, and with coloured glass, firing blends tones into unique gradients and new shades.

SLUMPING: Shaping glass with heat and gravity

Slumping is a technique where flat glass is heated until it softens and bends into or over a mould under gravity. Lower temperatures (600–700 °C) are used for subtle bends and simple shapes with minimal surface marks, while higher temperatures (750–830 °C) allow for more dramatic shaping, deeper imprints, and greater changes in thickness.

SLUMPING: Materials, moulds, and temperature control

Glass sheets, often cut into shapes, vary in properties depending on the manufacturer – especially in softening point, which determines when forming begins. At higher temperatures, different moulds define the final form, including reusable materials (ceramic, steel, vermiculite) and single-use options (ceramic powder). Together, temperature, mould choice, and glass type shape the final result.

USP's

How dreams take shape

Freedom through customisation
Fusing and slumping can be combined, layered, and adapted to a project’s unique demands. From single pendants to large-scale architectural installation, our techniques offer a level of bespokeness that others can’t match.
Rich textures & surface expression
From fine surfaces to bold textures, fusing and slumping create a distinctive material language. Unlike mere applied finishes, these surfaces are formed through the glass itself, giving each component tactile depth and visual presence that responds to light.
Light built into glass
By layering glass elements during fusing, we can introduce colour gradients, bubbles, nebula-like formations, and optical patterns directly into the internal structure of glass. The result is an embedded landscape revealed through light.
Glass that transforms light
Every texture, layer and internal formation changes how light travels through glass. Diffused or directional, soft or dramatic, the desired optical behaviour of each component can be designed, giving creative control over how glass looks and acts.
Unique by nature
While the process and parameters of these techniques are precise, alchemy still creates character. As no two firings are identical, each component produced through fusing or slumping retains an individual quality that cannot be fully replicated.
Form without limits
Slumping allows flat glass to become curved, organic and sculptural. From gentle bends to complex three-dimensional forms, the technique allows glass to follow the designer’s vision, and not the other way round.