The upgrading design was based on the ‘Tropical City’ theme, with improvements made to the terminal façade and airport facilities to enhance the overall experience of passengers at Changi Airport. A terminal-long sky roof with colour-changing LED lights and louvres control, as well as an iconic 204-metre long canopy at the departure kerbside count amongst the new features at Changi Airport. Natural lighting was also a key element in the upgrading works, with taller and unobstructed glazed walls incorporated into the architectural design, a sky roof, and a 12-metre high glass façade. Open spaces were emphasised with the higher-glazed glass walls. In addition, the 35-metre airside extension of the terminal provides a good, clear view of the aircrafts and runways.