Imitative polythematic fantasia. Pujol calls it the most important of the first group of nine fantasias. It is certainly the broadest and most technically demanding. It is the longest, the most intricate, and the más profundo. It begins and ends with imitative sections and the internal parts is largely free, derived from variants of a theme head M.C|C, with both ascend and descend stepwise motion. This flourishes into the final theme. The middle is clearly divided into short cadentially separated phrases. The work is continuous; the section divisions thus are ideas only. Harmonically adventurous in cadences and dim 6th.