Halo is an 18m-diameter steel lattice structure supported on a tripod five metres above the ground.
The core is open at the top, framing views of the sky. The steelwork has a natural silver appearance, which will temper to matt as the galvanised finish weathers. A unique feature of this Panopticon is that it is lit after dark and glows a sky-blue colour, giving the effect of hovering above the town. The lighting, using low-energy LEDs and powered by an adjacent wind turbine, is designed to minimise light pollution and avoid any disruption to wildlife.
Halo is positioned to be clearly visible from the M66 and A56 approach to Pennine Lancashire.