Elie has sent me links to two tools - Tulip and Circos. There's a video of Tulip in action here.
This is a useful tool for visualisation of trades and market data and has proved invaluable.
A variant of the Circos approach was used quite effectively to replay a time series of equities trades by sector to end users showing their P and L and risk. Today it's used for multi-venue market visualisation.