A few Sundays ago, we were filling the van up with diesel in Kaikoura before heading home, and there was a couple there with a tandem bicycle. Apparently, Mr. Inventor studied it closely while we were there, because the next day he started building one of his own! He cut apart two or three junk bicycles and started putting the pieces together. He’s stalled right now, waiting for his daddy to do some welding for him. We’ll see if it goes any further, but I was enjoying the initiative and inventiveness–and he’s learned a lot about fixing bikes from this!