Matrix Co-commissioned by the Site Gallery and VIVID, UK in 2001 for 'Everything is number' MATRIX is an interactive installation which uses retinal after-image technology to create virtual light sculpture within the mind of a viewer. With the support of NESTA the technology and method of this work has been patented (GB2340621) and is being developed for its commercial use. Formed within a new perceptual world, sculptures exist in an altered dream like reality. Created from the absence of photochemicals within the eye, the mechanisms of the viewer’s vision, firstly construct then erode the form. As the work is formed inside the viewer, documentation of the sculpture is impossible. The work asks how numbers are stored in the mind, where do they exist ? How are numbers or units visualised ?

1. Viewer enters a dark room. Their attention focuses on a small red LED in front of them.
2. With an interval of 10 seconds between each emission there are 3 flashes of light emitted from photographic flashguns placed 1.5m in front of the viewer.
3. Still in blackness, the viewer perceives a grid of multicoloured light spheres hovering in front of them and receding into the void.
4. A dim strobe light comes on, lighting up the installation room. Due to Emmert´s law* the viewer perceives a huge matrix of floating light spheres which appear to be solid and defining the dimensions of the installation space.
5. Strobe light goes off, the viewer leaves the room.

As the work is formed inside the viewer, documentation of the sculpture is impossible. The work allows people to observe their own eyesight, and asks the question, at which point does perception end and memory begin?

* Emmert's Law: After-images appear larger the more distant the screen on which they appear to lie. They (nearly) double in size with each doubling of distance.