Jeff Wall: Artists need material limitations  I have never read Ralph Ellison’s Invisible Man, but I have for a very long time been in love with Jeff Wall’s appropriation of it.    Jeff Wall: After “Invisible Man” by Ralph Ellison, the Preface, (1999-2001) * First shown at Documenta 11, After “Invisible Man” by Ralph Ellison, the Preface, (1999-2001),…