In the context of British Air Transport (painting), analyze the Structures of the Composition.
From left to right, the painting shows progression from Hounslow Heath Aerodrome's apron and hangars in 1919, then the old wooden air traffic control tower of the first Croydon Aerodrome (1920–1928), on Plough Lane, Wallington. To the right of the centre is the later air traffic control tower at Croydon Aerodrome on Purley Way (1928–1959), and further to the right are its hangars.
Hounslow Heath Aerodrome Wallington hangars air traffic control tower Purley Way Croydon Aerodrome