Phantasmagoria:

A confusing or strange scene that is like a dream because it is always changing in an odd way

-(merriam-webster)

‘Phantasmagoria' is evocative of a fantastic dream-like scene. One way this feeling is communicated is by the direction that the piece should be performed “liberamente”. Additionally, The flow of the piece is reminiscent of a free-flowing fantasy, with sections transforming into other material. To keep the structure somewhat coherent, all of the subsequent material is developed from the first phrase, since even dreams tend to have a foothold in reality.