WH Auden and phantasmagoria

[stemper]

Does anyone know the lines from Auden about art? He states that it is this (example forgotten) and that (also forgotten) and the lines conclude "the rest is phantasmagoria"? Can't find it anywhere. Thanks.

[blp]

Is it him who says '(example forgotten)' or you? Because, as you've written it, the description works exceptionally well for me.