A toy system comprising a plurality of toy construction elements, each toy construction element comprising coupling members for detachably interconnecting the toy construction elements with each other to create one or more coherent spatial structures; wherein the plurality of toy construction elements comprises: - an energy source device comprising a housing and, accommodated within the housing, an energy transfer circuit ; - one or more energy distribution devices , each configured to provide respective one or more external conductive loops extending outside the housing and defining a respective external energy transfer zone in a proximity of the respective one or more external conductive loops; wherein the energy source device is configured to be brought into operational connection with one or more of the energy distribution devices; and wherein the energy transfer circuit is configured to receive electrical energy from an energy source and, when the energy source device is in operational connection with a first energy distribution device of the one or more energy distribution devices, to energize the one or more external conductive loops of the first energy distribution device so as to create a time-varying electromagnetic field in an external energy transfer zone defined by the first energy distribution device in a proximity of the one or more external conductive loops of the first energy distribution device characterized in that the plurality of toy construction elements further comprises one or more electronic toy construction elements configured to receive energy from the time-varying electromagnetic field from one or more of the energy distribution devices when the electronic toy construction element is positioned in one of the external energy transfer zones. - an energy source device comprising a housing and, accommodated within the housing, an energy transfer circuit ; - one or more energy distribution devices , each configured to provide respective one or more external conductive loops extending outside the housing and defining a respective external energy transfer zone in a proximity of the respective one or more external conductive loops; wherein the energy source device is configured to be brought into operational connection with one or more of the energy distribution devices; and wherein the energy transfer circuit is configured to receive electrical energy from an energy source and, when the energy source device is in operational connection with a first energy distribution device of the one or more energy distribution devices, to energize the one or more external conductive loops of the first energy distribution device so as to create a time-varying electromagnetic field in an external energy transfer zone defined by the first energy distribution device in a proximity of the one or more external conductive loops of the first energy distribution device characterized in that the plurality of toy construction elements further comprises one or more electronic toy construction elements configured to receive energy from the time-varying electromagnetic field from one or more of the energy distribution devices when the electronic toy construction element is positioned in one of the external energy transfer zones. <EOS>