  A Legendrian link is called a d\'ej\`a vu link if its components can be
connected by a positive Legendrian isotopy but this isotopy cannot be embedded.
This is the contact geometric analogue of a pair of events in a spacetime such
that there are d\'ej\`a vu moments on every future-directed timelike path
between them. We construct d\'ej\`a vu links in several geometrically relevant
situations and discuss their basic properties.

Symplectic Geometry;Differential Geometry;Geometric Topology