A new set of pictures are doing the rounds on Twitter that are boggling the mind.

If you thought #thedress was confusing, try looking at this.

They are two identical images featuring painted fingernails held up to a mouth, but they appear in completely different colours - one is pink and the other is maroon. 

These images are identical, but they appear very different because of the background they have been placed on in Photoshop. The left picture was placed on a white background, the right picture was placed on a black background

The illusion comes just a month after the internet went into meltdown over a blue and black dress that almost 50 per cent of people saw as white and gold.  

The picture of #TheDress - as it became known - was first posted on Tumblr by Caitlin McNeill, a 21-year-old aspiring singer from Scotland, after noticing her friends saw different colours in the photograph.    

Even celebrities weighed in on the fashion debate, with Kim Kardashian asking her 29.4million Twitter followers to help settle a disagreement between herself and husband Kanye West.