Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Arts & Culture

Figure-Ground Relationship

Quick fact

The figure-ground relationship was famously illustrated by the Rubin vase illusion (1915), where the same shape can be seen either as a white vase or two black faces, but never both at once.

Why this is interesting

Have you ever stared at a cloud and suddenly seen a face, or looked at the famous Rubin's vase and seen two profiles instead? That's your brain making a split-second decision about what is figure and what is ground.