Known to visit four countries in one week, this peripatetic imagemaker grounds herself at the V.I.P. suite at the Spa at Mandarin Oriental hotel in New York, where she indulges in a two-hour ayurvedic treatment. It includes shirodhara, a continuous pouring of oil on the forehead and scalp, which is ‘‘supposed to open your third eye and take you to another place,’’ Cantello says. It costs an eye-opening $430.