Hilma af Klint was painting non-objective work before the date usually given for Kandinsky's first abstract watercolour. By how many years does she precede it?

4 (answers within ±1.5 count)

Four years, on the conventional dates, and the gap matters less than the sealing. Her instruction that the work not be shown for twenty years after her death meant it played no part in the argument at all, so priority here is a fact about chronology and not about influence.