The complex consists of two 587-foot (179 m), 65-story apartment towers, opened in 1963, which include physical plant penthouses. It also includes a 10-story office building (now a hotel) opened in 1964, and a saddle-shaped auditorium building originally used as a cinema. The four buildings, access driveways, and a small plaza that originally included an ice rink are built on a raised platform next to the Chicago River. Beneath the platform, at river level, is a small marina for pleasure craft, giving the structures their name.
Here is a post where you see the resemblance between them and actual corn cobs. I can't unsee it now...