Devendra Prakash Tiwari (born on November 18, 1961) from Bhopal, Madhya Pradesh, has designed 125 miniature models of war equipment all made with waste, a hobby he started in 1982. His models measuring 2 to 12 inches are replicas of earth mover machines, artillery equipment, war canons, tanks, anti-aircraft guns, fighter aircraft of World wars, helicopters, robot soldier and others.