Totally Thames festival, there was this installation called "Five Cowries Flotilla" outside the Tate Modern.
Initially it was a bit confusing, given that there were, after all, six of them.
But apparently the name relates to the Five Cowries Creek in Lagos, which is where the artist Polly Alakija got the inspiration. The traditional fishing craft were painted by school children there and then brought to London.
Very colourful they were too!