1960-62 
My conceptual art carrier began with the setup of my factory to produce nothings. Nothings come in generally three flavors, chocolate, strawberry and vanilla. Of these many more chocolate nothings were produced than the other flavors.  
Setting up the nothing factory required me to upturn my tricycle in the driveway. Making them required me to turn the wheel. If you turned it too fast it did not work. There are only so many nothings that can be produced in a day on a tricycle. Given its operation in a system of capitalism this stabilizes the price. 
My brothers, both older used to gang up on me. It was not all negative. If you want to read about that see “Timline Monopoly”. But they would gang up on me and steel my nothings. Normally I would not have noticed, but they would say, “I stole your nothings”. This would set me crying. They were mean.  It did not prevent me from making more. 
Recently I did something special for my son Ben. I said, “you owe me”. He promptly settled his debt to me by placing 5 nothings in my hand. I did not know where he got them from. He said he got them from his fiance’.