How many triangles are in this picture?

The simple illustration has been shared thousands of times on Facebook after leaving viewers scratching their heads.

VIDEO: The 'Disco Boob' trend at Splendour

Rachael Millen, of Newcastle, sporting the fashionable chest peace of glitter at Splendour in the Grass 2017 near Byron Bay.

VIDEO: Festival organisers forced to clarify policy on nudity.

Bieber quit tour to set up his own church?

Justin Bieber on stage during his concert at ANZ Stadium in Homebush.

Bieber is calling it quits on the rest of his Purpose World Tour

Bachelor hopeful ‘didn’t realise how naked she was’

The Bachelor Australia‘s Leah

Her dress was certainly daring, but she wasn't aware by just how much

Phelps shredded over shark race fiasco

"Phelps vs. Shark: Great Gold vs. Great White," with Phelps testing his speed against that of a great white shark.

People are genuinely upset at the way the race was run

Film boss marvels at Sunshine State

FOR REVIEW AND PREVIEW PURPOSES ONLY. Mark Ruffalo and Chris Hemsworth in a scene from the movie Thor: Ragnarok. Supplied by Marvel.

Thor: Ragnarok success may mean more Marvel movies for Queensland.

ABC's Q&A: Should 16-year-olds be allowed to vote?

Opposition Health Minister Catherine King on the Q & A panel, left, and right, Minister for the Environment and Energy Josh Frydenberg.

But there was one thing the students weren't discussing.

Wilkinson back on air after ‘holiday hell’

Lisa Wilkinson returns to air, cast in hand.

Lisa Wilkinson still feels "a bit ordinary" after holiday from hell

Prince Charles and Camilla heading for Qld

Prince Charles and Camilla

It promises to be a holiday fit for a King

Tough Thursday? Little Prince George can relate

THURSDAY is a tough one for most of us.

Mini ninjas get into training

Gary Nowlan, 12, of Gawler East trains in X-Park at Bounce.

Kids as young as 12 are already dreaming of becoming Ninja Warriors

RECAP: Game of Thrones s7 episode 2 - Stormborn

Kit Harington in a scene from season seven episode two of Game of Thrones.

*WARNING this story contains spoilers*

Clue buried in Game of Thrones intro

Is this a clue hidden in the Game of Thrones intro?

Is this a clue or a red herring left by the show's creators?

FINAL CALL: Princes’ regret over last words to Diana

Prince William and Prince Harry have opened up about their mum, Princess Diana, in a new documentary. Picture: ITVSource:Supplied

Two princes regret rushing the last phonecall with their mother

MasterChef’s Ben on drink-driving ban

Ben Ungermann and Diana Chan face off in the MasterChef Australia final tonight.

MasterChef finalist speaks out on drink-drive shame before cook-off

‘History-making’ Hah vows Ninja return

Stars of Australian Ninja Warrior Andrea Hah and Lee Cossey pictured near their home in the Blue Mountains.

Andrea Hah has vowed to return to Australian Ninja Warrior

‘Who thought this 9/11 movie was a good idea?’

Charlie Sheen is trapped in the Twin Towers on 9/11.

Has this Charlie Sheen movie already trashed on 9/11?

New Terminator? James Cameron wants back on board

T2: Judgment Day, was the most expensive film ever made at the time

Warner Bros. confirms a number of confusing sequels

Wonder Woman is getting a sequel.

There's some very good news for Wonder Woman fans

Why are backpacks banned from Splendour in the Grass?

GETTING READY: Splendour 'siJessica Ducrou (left) and Paul Piticco (right) with Police Commander for Splendour Gary Cowan.

Ban 'a sign of the times' say organisers

Ed Sheeran quits Twitter: 'Why do people dislike me?'

Ed Sheeran poses for a portrait in promotion of his full-length concert feature, \"Ed Sheeran: Jumpers for Goalposts\" on Friday, Oct. 16, 2015, in New York. (Photo by Drew Gurian/Invision/AP)

TROLLS have forced Ed Sheeran to quit Twitter.

Kanye West quits Jay-Z's Tidal after spat over money

Kanye West, left, and Jay-Z accept the award for best group for "The Throne" at the BET Awards on Sunday, July 1, 2012, in Los Angeles.

Kanye says he was owed AUD$3.8 million.

Adele concert tours are no more: Star quits life on the road

After a mammoth world tour, Adele hints she may never hit the road again.

Adele’s heartbreaking note to fans on final night of world tour.

Digging down to find Clare

Australian actress and singer Clare Bowen, who got her big break on the US TV series Nashville, is touring Australia with her solo album.

After five years on Nashville it’s time to tell her own stories.

Grinspoon to smash footy gig curse

Pat Davern and Phil Jamieson wearing their true colours.

THE battle for State of Origin rock supremacy is on.