Sentence:  the zippy musical numbers in which Mary Poppins (a stiff-lipped Emily Blunt) whisks cherubs Annabel, John, and Georgie (Pixie Davies, Nathanael Saleh, and Joel Dawson, respectively) away into colorful hyperreal <WSD>fantasias</WSD> impress. 
Meaning of the word marked with <WSD> tags:  Any unstructured work.