This is Nate's hand and ship you are looking at. The great story here is that Nate really wanted a lego ship that looked just like the one that Will had made for himself. You can see a section of it in the picture. Will is the naked boy in the background.
Anyway, Nate didnt' think he could make one so Will said he would make one for him and that is exactly what he did. Nate is just as proud of the ship he didn't make as Will is of his own ship.
I am always amazed at the things that the little ones can make at the age of 3 1/2 and I believe that is directly due to their older brother being so prolific with his own lego building.