thedress The Australian The Dress is now a Halloween costume I've been thinking about "the dress" for 10 years. Here's what I've learned. The dress was a viral online phenomenon in 2015, centered on a photograph of a dress that people disagreed on whether it was blue and black or white and gold. Within a ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive