Nowhere are the challenges and tensions of such forced collaborations more acute than in L.A. Unified, which has more charters — 225 — than any other school system.Howard Blume wrote an illuminating and straightforward description of two schools in Los Angeles that share the same space. One is a public school the other is a Gulen charter school. The charter invaded the public school, and appropriated many of its classrooms and facilities. The charter invaded the public school, and appropriated many of its classrooms and facilities.They have similar students (although about 40% of the charter students are drawn from outside the district); they have similar programs; they get similar results.Nowhere are the challenges and tensions of such forced collaborations more acute than in L.A. Unified, which has more charters — 225 — than any other school system.