Threshold
1. Point of entry or beginning
2. A limit below which no reaction occurs
3. A limit below which a stimulus causes no reaction
4. A strip of wood or stone forming the bottom of a doorway crossed in entering a room

Insertion The act or an instance of inserting
Materiality The quality or characteristics of being material or composed of matter

Reciprocity
1. The condition of being reciprocal
2. Mutual action
3. Give and take
Infrastructure
The basic structural foundations of a society or enterprise, a substructure or foundation
Coogee Beach Community Centre