Recalling the cosmos and our metaphysical relationship to space and time, Jack Whitten’s Portals series are visual reminders of the slippery threshold between science and metaphorical perception. Whitten began the series in 2015. They culminate in the large, shimmering, square “Quantum Man” works that introduce, for the first time, new materials such as lead, oak and various precious woods. The works are stunning yet humbling to behold. They remind the viewer of the insignificance of the human existence in relation to the metagalagtic space and the seductive power of things unknown. At Hauser and Wirth through April 8.