Are these flip flops blue and black or white and gold?

A photo uploaded onto Twitter on Nov 18, featuring a pair of Havaianas, had sent the Internet into a frenzy. 

This pair of seemingly innocent flip flops had created confusion over what colour the flip flops exactly are.  

Answers vary from blue and black, to black and brown, and some even white and gold. 

Previously, in February 2015, a similar picture surfaced and went viral.

Known as "The Dress", people had a heated debate over whether the colour of the dress is blue and black or white and gold. 

These different answers can be explained the same way as "The Dress". 

Dr Leo Seo Wei, an ophthalmologist, said,

"The reason people fall into different camps is because their brains perceive the background illuminating light differently."