Bongo is inspecting the finished product.  He likes it a lot because it puts him the right distance above the table.

The only problem is that the part is round, which Mr. Jim says is good, but it makes it uncomfortable to sit on.

Bongo is happy that he has beans in his butt instead of bones.  Having a bony butt would be bad. 

Bongo likes cushiony butts.

So does Mr. Jim.