A Trapezoid is NOT a Dinosaur!

Autographed picturebook with original sketch.
 
All the shapes want a part in Triangle's play, Shapes in Space. Square has all the right angles, Circle is on a roll, and Star shines the brightest. Trapezoid just doesn't fit in. Isn't that some kind of dinosaur? Determined to get a part, Trapezoid acts like all the other shapes, but must discover a way to use his own unique strengths to help make the show a blast.