I don't think you can talk about progress in art - movement, but not progress. You can speak of a point on a line for the purpose of locating things, but it's a horizontal line, not a vertical one.
Donald BarthelmeAnd I sat there getting drunker and drunker and more in love and more in love...And you can never touch a girl in the same way more than once, twice, or another number of times however much you may wish to hold, wrap, or otherwise fix her hand, or look, or some other quality, or incident, known to you previously.
Donald Barthelme