ITAP 1 (work in progress)

Notions of originality is a topic which got discussed in a lecture we had, which I though made a very good point because when creating a painting, photograph or even a commercial your idea generates from somewhere. To be able to create any of the above you need to be inspired, when you are inspired you take an element of that inspiration into your own work some people would call this stealing. Where do you draw the line when "stealing" someones ideas?