A piece of Happiness sign in Kuala Lumpur, Malaysia

A piece of Happiness sign in Kuala Lumpur, Malaysia in August 2017

Aboriginal children at Galiwinku, Elcho Island in the Northern Territory

Aboriginal children at Galiwinku, Elcho Island in the Northern Territory in June 2008

Aboriginal children playing on the beach at Galiwinku on Elcho Island in the Northern Territory

Aboriginal children playing on the beach at Galiwinku on Elcho Island in the Northern Territory. Photo taken in May 2008.

An Aboriginal girl in Gapuwiyak, Northern Territory

An Aboriginal girl in Gapuwiyak, Northern Territory in June 2009

Happy t-shirt in Chinatown, Bangkok, Thailand

Happy t-shirt in Chinatown, Bangkok, Thailand, in December 2009

If it makes you happy wear it slogan in a clothes shop in Istanbul, Turkey

If it makes you happy wear it slogan in a clothes shop in Istanbul, Turkey in February 2014

Happy Dao women in Sapa, Vietnam

Happy Dao women in Sapa, Vietnam in January 2012

A happy Dao woman in Sapa, Vietnam

A happy Dao woman in Sapa, Vietnam in January 2012

Who ever said money can't buy happiness didn't know where to shop, seen on a Huski Hampers sandwich board in Huskisson, NSW

Who ever said money can't buy happiness didn't know where to shop, seen on a Huski Hampers sandwich board in Huskisson, NSW in April 2012

Thai mother and child

Praew and her baby at Nim's birthday party in Canberra in December 2012

Happy Burmese woman

Happy young woman at the Burmese new year celebrations in Canberra in April 2013

Family relaxing at Koh Poda

Relaxing at Koh Poda, Krabi district, Thailand in February 2012

Cute Muslim girls

Muslim girls at the Oriental Village, Langkawi, Malaysia, in June 2011

Aimon and Chloe

Aimon and Chloe at Sahara restaurant in Chiang Mai, Thailand in September 2012

Girls having fun

Teenagers listening to music at Sankampaeng Hot Springs outside Chiang Mai, Thailand in September 2012

Happy times

Aboriginal children playing on the beach at Galiwinku on Elcho Island in the Northern Territory. Photo taken in May 2008

Thai couple

A Thai couple at Doi Inthanon, Thailand in June 2011

Billion of happiness

Wishing you billion of happiness sign in a shop window in Yangon, Burma in August 2010

Happy Malay girls

Two young Malay Muslim girls laughing at my attempt to photograph them at the market in Kuching, Malaysia in January 2012

Couple on a motorbike

Man and woman on a motorbike at the Chiang Mai bus station in Chiang Mai in December 2009