An international display of Pop art that's still inescapably American

PHILADELPHIA -- America haunts the "International Pop" exhibition at the Philadelphia Museum of Art. American power, American culture, American consumerism, American speed, the big, white toothy American smile. The first work you encounter upon entering this ambitious and absorbing exhibition bears the stamp of American might: Antonio Henrique Amaral's "XX/XXI (20th/21st-Century Tribute)" depicts four mouths with grotesque tongues, chattering against a background of stars and stripes.