7.1 Motivations

7.1.1 How do the twistors emerge?

7.1.2 Twistor space and the kinematical twistor

7.2 The original construction for curved spacetimes

7.2.1 2-surface twistors and the kinematical twistor

7.2.2 The Hamiltonian interpretation of the kinematical twistor

7.2.3 The Hermitian scalar product and the infinity twistor

7.2.4 The various limits

7.2.5 The quasi-local mass of specific 2-surfaces

7.2.6 Small surfaces

7.3 The modified constructions

7.3.1 The ‘improved’ construction with the determinant

7.3.2 Modification through Tod’s expression

7.3.3 Mason’s suggestions

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