How to Convince a Flat Artist That the Earth Is Round

In order to convince a flat artist that the world is round you've got to make him act consistently on his own proposition and go consistently westwards to find the edge of the world. In Zen when you finally convince the master that you are stupid enough to be accepted as a student because you've persisted he has warned you well in advance that he has nothing to teach but he says now i will ask you a question. There are many ways of asking this question but they all boil down to one common theme, which is who are you? You say you have a problem you say you would like to get out of the sufferings of your separate ego so what happens in effect then in the discipline