The internet loves a good optical illusion, and the latest to divide puzzle fans features a mystery lake.
The scene looks simple enough, but viewers are scratching their heads as to whether there is a wall in the foreground, or a body of water.
The puzzle originally appeared on PlayBuzz, before being picked up by a range of British newspapers.
If you guessed there was a lake in the picture, look again...
According to Playbuzz, what looks like a lake is actually a light-coloured wall, and the white 'shoreline' is the light catching the top of the structure.
Recently, another optical illusion that had the internet stumped involved a seemingly benign wall of bricks.
In the picture, what looks like a patch of plaster is actually a cigar wedged into the wall.