Jack Beder’s Concave Form (1965) is a refined example of mid-century Canadian abstraction in stone. Carved from pale grey marble with subtle crystalline veining, the work reveals Beder’s sensitivity to mass, light, and surface. The sculpture balances polished and textured finishes: broad, softly curved planes flow into a delicately stippled concave passage, creating a rhythmic interplay between light and shadow.

Beder’s organic abstraction evokes natural erosion and anatomical suggestion without resorting to literal representation. The artist explores the sculptural tension between solidity and void—between the physical presence of the material and the spatial recess within it. Concave Form embodies the modernist ideal of truth to material and reflects the quiet confidence of Beder’s mature work in the 1960s.