When we learn to meditate with an object it becomes very easy to come back to that object. But I think it is very important also to slowly, slowly learn to forget about having any object, and to allow the mind to do what it likes, just watching, just observing what the mind is doing.
In a way, what the mind is doing can be seen as an object. Let me take an example: When you allow the mind to do what it likes, then you realise that you are thinking. So thinking at that time becomes the object. The difference is, you do not get fixed, you do not focus on that thinking, but in a very loose, natural, relaxed way you allow the mind to do what it likes. Then from the thoughts it might move to a sound. When it moves to the sound, then you know: Now you are with that object; and then after a few seconds you come to the body, some sensations in the knee. So this is allowing the mind to scan, like in computer language: scanning.
So this can be done very easily in everyday life. For example you go to the office in the morning and you just sit there for a few minutes, you just allow the mind to do what it likes. Then you realise that you are seeing things, hearing things, just knowing what the mind is doing. So you can do it anywhere. In Sri Lanka sometimes I tell Sri Lankans, you can practice this waiting for a bus, getting in the bus, travelling in the bus, and even if you miss the bus! This is really objectless meditation.