"Play, sports, and games constitute a more varied, far older, and more popular field. Here a very different spirit of joy and gladness rules. Artifacts often enter but can not survive unless based upon pretty purely hereditary momentum. Thus our first problem is to seek both the motor tendencies and the psychic motives bequeathed to us from the past. The view of Groos that play is practise for future adult activities is very partial, superficial, and perverse. It ignores the past where lie the keys to all play activities. True play never practises what is phyletically new; and this, industrial life often calls for.