Left to right: Arnold Schoenberg, Otto Klemperer, Hermann Scherchen,
Anton Webern, Erwin Stein, 1924

The late great Hugh Maguire told me that Hermann Scherchen’s conducting technique was described as

like milking a flying gnat.

For a fleeting glimpse of this method, see the wonderful film Gennadi Rozhdestvensky—conductor or conjuror?, from 00.26, under Noddy: the art of conducting.