Image copyright AFP Image caption Swimmers gather in a pool at a water park in Pyongyang

While the majority of people in North Korea live in poverty, experts say there is a growing middle class with money to spend and free time to enjoy. From dolphin aquariums to shopping centres, this is how the country is changing to meet the demands of its most wealthy citizens.

When Jayden first used the internet he was overwhelmed by what he found.

"I had access to information that enlightened me. Every day was a surprise to me because I could get completely different perspectives that I'd never thought about. It made me outraged and sad," he says.

Jayden (not his real name) is a North Korean defector who fled to South Korea five years ago. Only a small number of people manage to escape the country, so his successful defection puts him in a privileged minority that mainly consists of young people such as him.

He recently finished an English-language course in Australia where he discovered YouTube and a host of online news sites.

These were new experiences because North Korea is one of the world's most repressive countries where basic freedoms, such as accessing foreign media, are severely restricted.

But while he was living in North Korea, Jayden frequently defied these constraints and accessed prohibited entertainment.

"I spent my spare time playing football and computer games or watching movies," he says. "Although, there were many restrictions on what could be done. Many of the movies and games were illegal but I did these things on the sly."

Media playback is unsupported on your device Media caption Four defectors talk about what life is like in North Korea

Secret fun

Unsurprisingly, there is a flourishing market for foreign entertainment in a country described as an "information black hole" by Reporters without Borders (RSF).

"The most popular pastime for North Koreans is also one of their biggest open secrets," says James Pearson, co-author of North Korea Confidential. "Most North Koreans secretly watch foreign media, particularly South Korean dramas."

"These shows offer Koreans on both sides of the border an escape from the pressures of daily life, the difference being in North Korea they're consumed in secret."

But not all forms of entertainment have to be enjoyed secretly. In fact, for North Korea's most affluent citizens, the very concept of free time is changing.

Image copyright AFP Image caption People enjoy the rides at the Rungra People's Pleasure Park in Pyongyang

Vanity projects

A report by the Korea Development Institute noted a boom in the construction of shopping malls, sports, and cultural centres. It also noted that North Koreans who live in Pyongyang now have a widening range of places to spend their extra money and spare time.

There are new water parks and even a dolphin aquarium, according to Curtis Melvin, a researcher who has spent years monitoring satellite imagery of North Korea and mapping construction sites.

"Satellite imagery is perhaps the most thorough way to monitor changes, as we can keep tabs on parts of the country that are not accessible to foreigners," he says.

"This has allowed us to monitor the growth in North Korean markets, changes in transportation, infrastructure, and the proliferation of renewable energy. We can see and measure these things in a way that was not possible a decade ago."

Image copyright Curtis Melvin/Google Image caption A satellite image showing Mirae Scientist Street, a housing project in downtown Pyongyang

This new technology has given him a fascinating insight into how life in North Korea is changing. He has recorded an increase in amenities and buildings that are designed, on the surface at least, to bring enjoyment to the North Korean people.

"Since Kim Jong-un took over when his father died in late 2011, he has initiated construction and beautification projects that have substantially altered the character of Pyongyang," he says.

"He has focused on construction projects that purport to raise the living standards of the people - such as new housing projects, a dolphin aquarium, new shopping options, new sports facilities, new amusement parks, water parks, 3D cinemas and a ski resort. Some of these types of projects are also being rolled out in the provincial capitals and special cities as well."

So why has Kim Jong-un decided to construct these leisure facilities? One suggestion is vanity.

"Part of it is to modernise Pyongyang and make it more of a 21st Century showpiece," says Andray Abrahamian, a visiting scholar at the Center for Korean Studies at the University of California, Berkeley.

"The labour is practically free, done by military conscripts, and the materials are mostly domestically sourced, so costs are pretty low," he says.

Media playback is unsupported on your device Media caption BBC correspondent Stephen Evans spent a day relaxing with the residents of Pyongyang

Although a booming leisure industry may seem positive, only a privileged minority are likely to benefit.

A different world

Income inequality in North Korea is rife, and the economy is mainly geared towards supporting a large military. This means the showpiece projects such as water parks, sports facilities and 3D cinemas can only be enjoyed by wealthy, usually urban-dwelling, citizens.

As Andray Abrahamian says, Pyongyang's entertainment is only available to the better off: "If you're privileged you may play squash, take yoga classes, enjoy nice restaurants - including a couple of decent Italian and Japanese spots - and sip cappuccinos at cafes. In a way, being privileged in Pyongyang is like being solidly middle-class in a wealthier country."

But this middle class, with their appetite for Pyongyang's finer elements, are a relatively new phenomenon.

Image copyright AFP Image caption The Masikryong ski resort, near North Korea's east coast port city of Wonsan

"The rise of the 'donju' - literally, masters of money - has created a new, moneyed, middle class that has a healthy thirst for consumer goods and spending," says James Pearson. "This has in turn given rise to more restaurants, bars, and even coffee shops in relatively rural or provincial towns which had very little before."

So to a large extent, the rise in places where North Koreans can spend their money and enjoy themselves is down to a growing middle class. But the gulf in living standards between urban and rural areas in North Korea remains stark.

"People outside of Pyongyang live in a different world," James Pearson says.

"They work hard to make a living with little supporting infrastructure. Farmers still have rigid production quotas to meet. Many do not have access to clean drinking water or reliable electricity. They have standards of living well below people in the capital."

Image copyright Getty Images Image caption North Koreans living in rural areas are unlikely to notice the construction boom

And when Jayden thinks back to his time in North Korea he remembers this wealth divide clearly. "I think there is an immense gap," he says.

"Not many, but some people can enjoy their lives by having dinner at restaurants or visiting some places. But many people worry about their next meal. I saw various people in many social statuses and I realised the rich-poor gap was quite severe."

This means leisure time is a luxury only available to the richer residents of Pyongyang. For those living elsewhere, the introduction of amenities such as cinemas and ski resorts is likely to go unnoticed.