We sincerely apologize for stoking this type of fire again, but a new version of 'the dress', 'cat on the stairs' and 'girl underwater or not' illusion has made its way online. Unsurprisingly, it's going viral.
Swiss photographer Tiziana Vergari recently posted a picture on Instagram that has several people scratching their heads in wonder. All anyone has to do is figure out how many girls there actually are in the photo.
The picture was submitted last week on March 7, as an entry for Instagram's Weekend Hashtag Project - #WHPidentity - that aimed to celebrate individuality through photos and videos.
The photo soon became very 'liked' - over 12,900 and counting - as more and more people tried to identify the exact number of girls they thought were photographed. Popular guesses among the 650 odd comments are 2, 3 and 4.
So what do you think? How many girls are actually there in the photo? Share your guesses in the comments section below.