Bleigiessen Glass Sculpture - Thomas Heatherwick, Artist. This 30m (that&#39;s 8 stories to US readers) high piece of loveliness hangs in the atrium of the Welcome Trust Building in London. Designed by Thomas Heartherwick, the sculpture uses 142,000 glass spheres suspended on 27,000 high tensile steel wires. The effect is almost like a waterfall of light and color.