The EPC does not define what is meant by "invention", but Art. 52(2) contains a non-exhaustive list of things which are not regarded as inventions. It will be noted that the items on this list are all either abstract (e.g. discoveries or scientific theories) and/or non-technical (e.g. aesthetic creations or presentations of information). In contrast to this, an "invention" within the meaning of Art. 52(1) must be of both a concrete and a technical character (see G‑I, 2(ii)). It may be in any field of technology.[Art. 52(2); Art. 52(3); ]