was the distance from its feet to the ground and what this agent has learned is to simply grow a very tall body and do some kind of a backflip to make sure that its feet are very far from the ground to give you one final idea of how hard it can be to the reward shaping I mean look at this shaped reward function for a robotic control task I don't even want to know how long the people from this paper spent on designing this specific reward function to get the behavior that they wanted and finally in some cases like alphago for example by