in gym_pusht/envs/pusht.py [0:0]
def add_circle(space, position, radius):
body = pymunk.Body(body_type=pymunk.Body.KINEMATIC)
body.position = position
body.friction = 1
shape = pymunk.Circle(body, radius)
shape.color = pygame.Color("RoyalBlue")
space.add(body, shape)
return body