”Multiculturalism” in contemporary Taiwan is essentially a rhetoric celebrating formal diversity and paradoxically an ideological agenda for nation-building. Vital issues such as social equality, inclusive citizenship and radical individuality are silenced amidst the cacophony of multiculturalism. Under the cover of rhetorical reasonableness, multiculturalism in Taiwan is secretly against the cultural diversity as such by taking the latter as means to the final end of national unity. Multiculturalism is paradoxically monoculturalism. As a theoretical formation, multiculturalism is surprisingly numb in reflecting upon its relation to the idea of empire, the neo-liberal globalization and an idea of radical particularity. The paper attempts to offer an immanent critique to the idea of multiculturalism by pointing out its aporia and potentiality, and argues that only through a radical rethinking of three meta-dimensions of multiculturalism, i.e., time, space and subjectivity, can the idea of multiculturalism be rescued from its rhetorical excess.