Pharrell Williams and celebrity interdisciplinarity.What Williams does reveal is the heft of a well-stocked Rolodex. His career as a producer of hip-hop, pop, and R&B hits has involved him in numerous high-profile collaborations, so his taking a similar approach to art and design endeavors is entirely natural. And his mainstream fame has unquestionably smoothed the road to some creative partnerships that lesser-known figures might never have finagled. Williams has fingers in a few more-altruistic pies, running, for example, a networking site for young emerging talent called artst.com — "spelled without an i, because it’s not about me; it’s about you." But at this level, it’s all about the Benjamins. Whether prevailing economic conditions will encourage celebrities to stick to what they do best or barely scrape the surface of PR- and dealer-friendly projects remains unclear. A trailed project for Craig Robins’s Design Miami fair is apparently still hush-hush, Williams demurring, "I can’t get into that."