Modern Arabic poetic forms developed in conversation with the rich Arabic poetic tradition, on one hand, and the Western literary traditions, primarily English and French, on the other. In light of the drastic social and political changes that swept the Arab world in the first half of the 20th century, Western influences often appear in the scholarship on the period to be more prevalent and operative in the rise of the modernist movement. Nevertheless, one of the fundamental forces that drove the movement from its early phases is its urgent preoccupation with the Arabic poetic heritage and its investment in forging a new relationship with the literary past. The history of poetic forms in the first half of the 20th century reveals much about the dynamics between margin and center, old and new, commitment and escapism, autochthonous and outside imperatives. Arabic poetry in the 20th century reflects the political and social upheavals in Arab life. The poetic forms which emerged between the late 1940s and early 1960s presented themselves as aesthetically and ideologically revolutionary. The modernist poets were committed to a project of change in the poem and beyond. Developments from the qas̩īdah of the late 19th century to the prose poem of the 1960s and the notion of writing (kitābah) after that suggest an increased loosening or abandoning of formal restrictions. However, the contending poetic proposals, from the most formal to the most experimental, all continue to coexist in the Arabic poetic landscape in the 21st century. The tensions and negotiations between them are what often lead to the most creative poetic breakthroughs.