All together now .... 100,000 to celebrate North Korea's birthday in synchronised style

From a distance, the mosaic-like screen of shifting colours almost appears to be electronic, lighting up a North Korean stadium like a huge TV.

But on closer look, it's not a screen at all: It's thousands of people holding up coloured placards, shifting them in synchrony to create the effect of a moving image.

The participants in the background are mainly students, and they practiced for many months, if not longer, to put together their part of a huge North Korean spectacle known as the Mass Games - a gathering that includes over-the-top gymnastics and dance performances, and proclamations of loyalty to the isolated country's leader.

It has been five years since North Korea last held the last Mass Games, but this year's version is set to begin today.

It will be part of North Korea's 70th anniversary celebrations, and the theme is "The Glorious Country."

Other events planned for the anniversary include a military parade, which may include the showing-off of equipment.

The BBC reported that tens of thousands of people are expected to march in the parade, after much intense practice. And anniversary celebrations are expected to last about a month.

The games aren't so much games as they are a 90-minute gymnastics or dance performance. More than 100,000 people have participated in past games, and in 2007, Guinness World Records said they took the cake as the largest gymnastics display in the world with 100,090 participants.

On tour company Koryo Group's website, the games are described as "an art form in North Korea, developed over decades, which can involve up to 100,000 performers in massive synchronised displays of gymnastics and dance."

Koryo said tickets to this year's event range from around US$115 to US$915 for the best seats in the house. And Radio Free Asia reported that North Korea has offered free tickets to this year's event to some Chinese business executives in an effort to lure investment.

As it prepared for the celebrations, the Government reportedly stopped issuing tourist visas, and North Korean authorities blocked Chinese tour groups from visiting, saying all the hotels in the capital were being renovated. Radio Free Asia reported that the Government was also cracking down on "nonsocialist" behaviour, policing haircuts that were deemed to not be a good match for socialism.

There had initially been speculation that Chinese President Xi Jinping would attend this year's games, but China is sending its third-ranking party official instead.

A Syrian delegation arrived this week and South Korean President Moon Jae In will visit Pyongyang later this month.

Past attendees have included former US secretary of state Madeleine Albright, who on a 2000 visit to Pyongyang, met then-North Korean leader Kim Jong Il, who brought her along to the games.

The Washington Post reported at the time that "choreographed as it may have been, it was a stunning display of fervour that evoked chilling reminders of the mass rallies of the Third Reich. At the end of the performance - which had a strident, militaristic theme - the cast of thousands broke into a frenzied chant: 'We shall defend our Dear Leader.'"

Kim Il Sung, Kim Jong Il's father, founded the Kim regime, which is now led by Kim Jong Un.

ABC News reported that Kim Jong Il once said that the games were a crucial part of children's training as communists.

"The schoolchildren, conscious that a single slip in their action may spoil their mass gymnastic performance, make every effort to subordinate all their thoughts and actions to the collective," he reportedly said.