What is ...?

• an Amoeba?

• a Brane?

• a Bubble Tree?

• a Building?

• a Coarse Space?

• a Dessin d'Enfant?

• a Gerbe?

• a Horseshoe?

• an Infinite Swindle ?

• a Lefschetz Pencil?

• a Minimal Model?

• a Motive?

• an Open Book?

• an Operad?

• a Projective Structure?

• Property (T)?

• a Pseudoholomorphic Curve?

• a Quantum Group?

• a Quasiconformal Mapping?

• a Quasi-morphism?

• a Stack?

• a Strange Attractor?

• a Syzygy?

• a Topos?

• a Train Track?

• a Tropical Curve?

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