The black part - made of high glossy black painted glass panels and windows - divides the white cantilevered volumes which helps them appear like they are floating in the air.

黑色的部分——使用高光泽的黑色喷涂玻璃嵌板和窗户——区分开了白色的悬臂体量，使他们看起来像是漂浮在空中。

youdao

Big, blocky, black, with painted-out windows, it looks more like a police mortuary van than a symbol of hope arriving on your street.

BBC: Obama's battle bus no symbol of hope