Question: What first appeared in Colonel William Light’s designed  layout and development programme for the city of Adelaide, South Australia?

Context articles: Street Naming Committee (Adelaide)
William Light
Light's Vision
Light Square
West Terrace Cemetery
County of Light
Netley, South Australia
Flagstaff Hill, South Australia
Electoral district of Light
Marion, South Australia

The Street Naming Committee was set up to decide the names of the streets, the squares and the river of the new settlement of Adelaide, South Australia, as it had been laid out by Colonel William Light in 1837.
 Light's map corresponds to the modern Adelaide city centre and North Adelaide.
 The committee met on 23 May 1837.
Colonel William Light (27 April 1786 – 6 October 1839) was Eurasian, an artist, naval and army officer and the first Surveyor-General of the Colony of South Australia.
 He is famous for choosing the site of the province's capital, Adelaide, and for designing the layout of its streets and parks – in the Adelaide city centre and the Adelaide Park Lands.
The first surveyor-general of Adelaide, South Australia, Colonel William Light designed a layout and development programme for the city.
 This plan is now known as "Light's Vision".
 Notable aspects of Light's plan are that the city centre is laid out in a grid-like pattern, with squares in the centre of the city and in the centres of the four quarters of the city, (NW, NE, SE, SW), and the city is surrounded by Parklands.
Light Square also known as Wauwi is one of five squares in the City of Adelaide.
 Located in the centre of the north-western quarter of the Adelaide city centre, the Square is named after the city's planner, Colonel William Light.
The West Terrace Cemetery is South Australia’s oldest cemetery, first appearing on Colonel William Light’s 1837 plan of Adelaide.
 The 27.6 ha site is located in Park 23 of the Adelaide Park Lands just south-west of the Adelaide city centre, between West Terrace, Anzac Highway, Sir Donald Bradman Drive and the Seaford–Belair Railway Lines.
 Originally known as the Adelaide Public Cemetery, it is divided into a number of sections for various communities and faiths, including two Catholic areas, as well as Jewish, Afghan, Islamic and Quaker sections.
The County of Light is one of the 49 counties of South Australia.
 It was proclaimed by Governor George Grey in the 1840s and named for Colonel William Light, the first Surveyor-General of South Australia.
 It covers the modern region of the Barossa Valley including much of the northern Mt Lofty Ranges.
 It is bounded by the upper Wakefield River in the north, the approximate path of Horrocks Highway in the west, and the Light River in the south.
Netley is a suburb of Adelaide, South Australia, in the City of West Torrens.
 It is located about halfway from the Adelaide city centre to the coast, on the southeastern boundary of Adelaide Airport.
 The northern part, south of Richmond Road and west of Marion Road is predominantly industrial.
 South of Watson Avenue, the suburb is mainly residential in character, including both a kindergarten and retirement village.
 The Netley Primary School closed and merged with others to form William Light School for the 1998 school year.
Flagstaff Hill is a suburb in the City of Onkaparinga local government area.
 It is named after the hill by that name in the area, where Colonel William Light erected a flagstaff during his survey, which was then used as a trig point.
 Flagstaff Hill is a leafy suburb established around the Sturt Gorge Recreation Park, maintaining many parks and reserves throughout the suburb.
Light is an electoral district of the House of Assembly in the Australian state of South Australia.
 As its area overlaps or is adjacent to the south western portion of the Light Regional Council and the south bank of the Light River, it is indirectly named after Colonel William Light, the first Surveyor-General of South Australia.
 The electorate was created in 1857, abolished at the 1902 election and recreated at the 1938 election.
 Covering a total area of 459.7 km², Light consists of Gawler, surrounding areas and rural areas to the north, extending south of the Gawler River through to the far outer northern Adelaide suburbs of Munno Para West and parts of Munno Para Downs.
 It is classed as a rural seat.
Marion is a suburb in the City of Marion in Adelaide around 10 km south-west of the CBD.
 Founded as a rural village in 1838 on the banks of the Sturt River, Marion was found to have rich soil and the population expanded rapidly.
 Colonel William Light laid out the plan for the village, as he had done with the City of Adelaide itself.