In physics, matter is commonly defined as the substance of which physical objects are composed, not counting the contribution of various energy or force-fields, which are not usually considered to be matter per se (though they may contribute to the mass of objects). Matter constitutes much of the observable universe, although again, light is not ordinarily considered matter. Unfortunately, for scientific purposes, "matter" is somewhat loosely defined. Regarding this difficulties concerning the definition of "matter", V.I. Lenin in his work "Materialism and empiriocriticism" proposed to define "matter" as the objective reality, which is given in our senses and is reflected by them.