draw a line and follow it (until it forms the circumference of the earth)...
"this year i was able to draw A LINE 7,200 (seven thousand and two hundred) METERS LONG. (the first series of lines, begun in 1959 had a maximum length of 33.63 meters.) this is the first series of lines of exceptional length of which i will leave one sample in each of the principal cities of the world. (each line, when it is completed will be vacuum-packed in a special stainless steel case that will be hermetically sealed.) the series will be completed only when the sum of the lines will be equal to the circumference of the earth".
piero manzoni, 1960
excerpt from "immedate projects" studio international