HOVERBOY AND MR. INCREDIBLE. FRIEND OR FOE?!
What could that be perched on the shelf of Mr. Incredibles private trophy room? According to one Hoverfan, it looks like Hoverboy's helmet. It DOES look reminiscent of some incarnations from the early 1960's, when for a brief time, artists dropped much of the "bucketness" of Hoverboy's headgear. It only lasted a short while, but it may have left a lasting impression on INCREDIBLES director Brad Bird, or one of his Pixar crew.
Fun to speculate nonetheless.