Pi (π) | Glass sculpture

by Anna Alsina Bardagí

Pi by Anna Alsina Bardagi
Optical glass sculpture
Pi optical glass sculpture

About the artwork

 

Title: Pi

Material: Eco optical glass

Edition: Unique artwork

Process: Cast glass, polished, and sandblasted

Dimensions: 15.5 x 15.5 x 17.1 cm (6.1 x 6.1 x 6.7 in)

Year created: 2026

Pi glass sculpture

FAQs about Pi glass sculpture

What techniques were used to create Pi?

PI was created using kiln-casting techniques. The process began with a plaster mold forming the round structure, which was placed in the kiln encased in vermiculite panels. Glass blocks were sandblasted and positioned according to precise calculations, then assembled inside the mold to construct the internal configuration. The sculpture was fired for approximately two weeks, following a slow and controlled heating and cooling cycle to ensure proper annealing. After firing, the piece underwent extensive cold-working to achieve optical clarity and transparency.

How are the internal effects achieved?

The internal effects were achieved through the preparation and placement of glass blocks inside the vermiculite mold before firing. Each element was sandblasted and positioned according to precise calculations to define the sculpture’s internal configuration.

What type of glass was used?

Pi was made using Ohara eco-optical glass S-BSL7, a lead- and arsenic-free glass selected for its high purity and controlled light transmission. Its optical properties allow the internal sculpture’s configuration to emerge as light moves through the form.

How long did it take to make Pi?

The creation of PI took approximately three months from initial concept to completion. This included the preparation of the plaster and vermiculite mold system. It was then followed by the kiln-casting phase, which lasted around two weeks. The process was completed with an extended period of cold-working to reveal the internal structure of the optical glass sculpture.

Does light affect the sculpture’s appearance?

Yes. The appearance of PI changes depending on the direction and quality of light. As light passes through the glass, it is transmitted, reflected, and refracted, revealing different depths. The sculpture shifts in perception as the viewing angle and lighting conditions change.