Remember the colour-changing dress that caused so much confusion last year? Well, this time around, we have a new version and internet users are puzzled.
A Twitter user tweeted a photo of this footwear and asked, "What colours do you see?”
While some saw the slippers as gold and white, others saw blue and gold and some even saw black and blue.
A similar debate was sparked last year as millions wondered whether the dress below was blue and black or gold and white.
This has led a few neuroscientists to do a research about the colour perception.
So, what colours are these slippers?