Acknowledgements

Source: Marina_Bay_Sparkles_(6198274317).jpg
Author: Michael Elleray
Licence: (CC Logo) CC BY-SA 2.0
Modifications: Image desaturated, cropped.
Source: Perth_CBD_from_Mill_Point_banner.jpg
Author: JJ_Harrison
Licence: (CC Logo) BY-SA 3.0
Modifications: Image areas burnt, contrast increased, desaturated, cropped.
Source: Wellington_city_day_and_night.jpg
Author: Donovan Govan
Licence: (CC Logo) BY-SA 3.0
Modifications: Image desaturated, darkened, cropped.
Source: Sydney Harbour pano at night.jpg
Author: Flickr
Licence: (CC Logo) CC BY-SA 2.0
Modifications: Image desaturated, cropped.
Source: Dusk_over_City_of_Melbourne_(9534781183)_(2).jpg
Author: Chris Phutully
Licence: (CC Logo) CC BY-SA 2.0
Modifications: Image desaturated, cropped.