Kato invited some neighborhood residents and held a tea part on a Mexico City street corner. Then he made a suggestion─ “Let’s use the tables to block the road.” When a car came, they parted the tables. When it passed, they closed up the road again. Through repeating these motions, they tried to make the relationship between public and private visible, as if revealing a magnetic field. The magnetic field itself is invisible ─ it can only be seen through the workings of magnets. Here, the two tables are moved by the presence of the public realm (in this case, cars coming through) as two magnets from opposite poles repel each other.