The coming to be is a change where nothing persists of which the resultant is a property. In that particular change he introduces the concept of potentiality ("dynamis") and actuality ("entelecheia") in association with the matter and the form. Referring to potentiality, this is what a thing is capable of doing or being acted upon if the conditions are right and it is not prevented by something else. For example, the seed of a plant in the soil is potentially ("dynamei") a plant, and if it is not prevented by something, it will become a plant. Potentially beings can either 'act' ("poiein") or 'be acted upon' ("paschein"), which can be either innate or learned. For example, the eyes possess the potentiality of sight (innate – being acted upon), while the capability of playing the flute can be possessed by learning (exercise – acting). Actuality is the fulfilment of the end of the potentiality. Because the end ("telos") is the principle of every change, and for the sake of the end exists potentiality, therefore actuality is the end. Referring then to the previous example, it can be said that an actuality is when a plant does one of the activities that plants do.