Think of when we have an active dialogue in groups. Due to the context we are generally using the prefrontal cortex, or the logic center of our brain.

Yet when we get our hands involved, such as when we build our thoughts and ideas out of LEGO bricks, we are using more parts of our brain.

Our hands, as pictured in the cortical homunculus image above, are activating more neuron networks in our brain, which in turn can give us access to more information or knowledge that might have not been accessible when just working verbally.