Do you enjoy building airplanes, cars, houses, or robots with Lego blocks? Humans are the only animal species that can create complicated constructions from simple Lego blocks - our Lego building ability is "human-specific," since it is only found in human beings. What would our closest relatives, apes or monkeys, do with a box of Lego blocks? They'd probably chew on them, and lose interest when they find out that they are not edible! Why are humans the only Lego builders in the animal kingdom? What happens in our brains when we build a Lego construction? Let's first take a look at how humans differ from other animals.