Short polythematic fantasia, 74 compases opening and closing with not too rigorous imitation, between which is sandwiched idiomatic redoble & consonance writing.
Theme I begins a section of loose imitation, followed by free phrases to K at 25. 1 is stated again to begin the redoble section which occupies most of the piece. K at 60 and stretto of theme 2 (to reinforce the return to tonic ?) begins final section.