You can not touch the beans and feel the texture - but that texture can tell you much about the level to which it was roasted.  Light roasts (City and City+) will have a bumpy texture and unevenness that you can actually feel.  Darker roasts (Full City and Full City+) will have a smoother texture and even quality.  Very dark roasts (Vienna and French) will have an oily surface that you can detect by touch.