A puzzle that children under 10 can solve almost instantly is completely baffling adults - who just can't seem to get their heads around it.
The brainteaser has been created by National Geographic and is designed to test children's logic skills.
In the image, a yellow bus is shown with identical windows, making it difficult to determine which is the front and which is the back.
To solve the riddle, puzzlers must work out which end of the bus the passenger doors are located on - and therefore which way the vehicle will be travelling.
But while 80% of children under 10 answered the question correctly almost instantly, adults are struggling to work it out.
The correct solution is that, for us in the UK, the bus is travelling to the right, because we drive on the left side of the road.
For those living in countries that drive on the right side, the bus is travelling left.
The reason adults find it so difficult compared to their younger counterparts, is because children under 12 reportedly perceive visual information differently, according to research from the University College London.