Anchor: In front of the National Gallery is the Royal Scottish Academy building, designed as almost its twin.
Entailed: The national gallery and royal Scottish academy are twins. 
Contradiction: The National Gallery and the Royal Scottish Academy building spot distinctly different outward appearances. 
Contradiction: Both buildings look extremely different from one another. 
Contradiction: The room is empty
Contradiction: the big boat is sailing with passengers.
Contradiction: A riderless horse runs freely through a field.