My workplace is under the pattern for Chicago Executive (PWK) and we sometimes get interesting/unusual things flying overhead. Yesterday I heard something that sounded very different from a "normal" aircraft; I looked up and saw a straight-wing prop twin with canard, and what appeared (from below) to be just a thin pipe connecting the fuselage to the empennage (with horizontal as well as vertical fin). Maybe like a Piaggio / Diamond crossbreed? I don't recall whether the props were in front or behind. Sorry about the sparse description but that's the best I can do.