A three-dimensional sensibility is at work at the Guggenheim’s first ever artist-curated exhibition, Artistic License: Six Takes on the Guggenheim Collection.  The first dimension is the initial shock of the viewer confronting the artworks; the second is the awareness as you move from one selection to the next, that there’s another mind, the curator’s, at work.  The third dimension as you move through the six levels of the rotunda, is the merging of the viewer’s take along with the curator’s own into a rich, sometimes disorienting, dizzying impression.