This is only a rough edit!
The tables were spaced to have gaps between them and brown paper was laid over the tables, covering the gaps. 5 big LED lights were underneath the set and the light passed through the gaps in the tables.
The 50 buildings were then placed on top of where the gaps were and holes cut in the brown paper to allow the light through.
Cardboard was wedged between the gaps to block light passing through the paper where there were no buildings.
Cardboard was then by wrapped about the tables to contain the light.
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