On a blazing-hot September day, hundreds of media outlets from around the globe gathered in downtown Los Angeles to be the first to experience Edye and Eli Broad’s extensive contemporary art collection at its new home—the Broad museum, which opens to the public tomorrow with free admission. With the 120,000-square-foot museum at his back—its matte-white exterior, porous and sponge-like, establishing a brilliant contrast to Frank Gehry’s shiny and smooth Walt Disney Concert Hall directly to the north—Eli addres…