This is another public art sculpture located in the City of London on Fenchurch Street. The artists are Michael Vsocchi and Lemn Sissay.
It consists of 17 carved granite columns around a granite podium inscribed with words from the poem "Gilt of Cain" by Lemn Sissay.
The sculpture stands on a spot that was once the churchyard for St. Mary Woolnoth Church and is where William Wilberforce, the abolitionist listened to the sermons of the Rev. John Newton. Newton was a slave trader turned anti-slavery preacher. He and Wilberforce worked together to end slavery in the United Kingdom.
You can find more about the sculpture here.