The installation of The Weather Project at Tate Modern typifies the more adventurous side of work undertaken by Unusual.

The Weather Project is one of the most mesmerising and largest art installations ever seen in the UK. It occupies the entire Turbine Hall, which in itself appears to have doubled in size due to the nature of the installation. The Icelandic/Danish artist Olafur Eliasson has used the media of light, sound, mirrors and fog to create a sunrise.

The effect is created using around 35,000 square feet of mirrors and 200 low-sodium monofrequency lights along with a highly creative variety of fogs and mists.

The task of installing the mirror and sun fell to John Roberts of Unusual Rigging. The main challenge was the required perfection of finish on such an enormous scale. There were 300 mirror panels, which were grouped into 19 large (17 metre by 7 metre) sections and than lifted into position. The effect had to be one of a completely level mirror ceiling. The sections were put together on a clean flat floor, levelled off and then lifted. Some of the sections were subject to both vertical and lateral lifting movement. However, each group of panels was supplied by the German fabricators Alluvial with only two hanging points. The effects of air movement and static electricity were only two of the contributing factors to the movement of the sections once lifted and Unusual subsequently spent the best part of four weeks recalibrating the panels in the air to produced the required effect.

Conditions for rigging the false ceiling were less than ideal. The summer of 2003 will go down as one of the hottest in living memory. Even during this installation period in September, the temperature was 28 degrees centigrade. Add to this the glass roof of the Turbine Hall and a few thousand square feet of mirror - John Roberts and his team of riggers currently resemble barbecued shish kebabs.