It's by an artist named Kester.
I read that African artists have collected 600,000 weapons in nine years. People exchange them for things such as sewing machines, building materials, and tools.
This reminds me of the verse
"They will beat their swords into ploughshares and their spears into pruning hooks. Nation will not take up sword against nation, nor will they train for war anymore." Isaiah 2:4, Micah 4:3