The characteristic features of Beethoven’s late style

What are some of the characteristic features of Beethoven’s late style? write around the following key points： 1)Beethoven’s Late Period Expansion of form Ambiguous form/Fusion of form Varying the number of movements Shifting the weight of the work to the end Blurring of structural divisions Use of variation form Fugal and canonic imitation 2)Beethoven‘s Late Period works