Joe, like Joan I have come back even next day and my comments are still there when I forget to send. Sorry you lost yours.
Robin, I love your sketches. the one in the car is amazing and the idea for holes is super.
Joan, the bridge is a big and good idea for metal! Your smile makes me smile, too. Great finds for engine and rubber. Really nice tire sketch, well, both. I like your idea for straight. I started one at the waiting room the other day and didn't finish. The chair was complicated so I abandoned the sketch. Yours is so fine.