Polythematic, imitative, long fantasia 188 compases. Individualistic themes, including no.1 with a rest, in monothematic episodes of rather typical construction. Theme 1 however is 8 composes long. Theme 2 is descend 3rd motive, themes 3 + 6 are virtually identical.
I theme 1 imit long section 1-62: S/A – T/B pairs then suelto thematic entries.
II (59-77) dovetails over I imitative
III (77-91) theme 3 beginning of 2nd phase of piece – echo imits.
IV (91-116) theme 4 imit
V (116-149) begins 3rd phase with echo imitations then suelto of 5.
VI (149-188) theme 6 suelto imitations, then welded into a sequential unit treated as a network a 4 with 6 in outer parts in 10ths + inner voice motives >> K.
Most atypical and inventive / effective passages of piece.