Nathan Black says: "I collect pictures of people's knuckle tattoos and the stories behind them. I've got about 170 or so sets up and I've been collecting them for about a year and a half."
Previously on Boing Boing:
• Subcutaneous brass knuckle implants
• Brass-knuckle purse said to land wearer in airport security hell
• LOVE / HATE knuckle tat gloves
• HOWTO knit gloves with "knuckle tattoos"
• Wooden brass knuckles