A system for assisting a user to build an image on a body structure wherein the system comprises: - a body structure comprising a plurality of coupling structures (5, 5', 5", 6, 6', 6") arranged on a base portion and being configured to receive a building element (4, 4', 4", 7, 7', 9, 9'), - an illuminator which is an illumination device configured to provide illumination of at least a portion of the body structure and hereby provide a number of illumination areas (12, 12"), whereby the system comprises - a control unit configured to be applied to select a subset of the coupling structures (5, 5', 5", 6, 6', 6") and initiate an illumination that enables a unique identification of the selected subset of the coupling structures (5, 5', 5", 6, 6', 6") to be established by means of the illumination wherein - the control unit is configured to select the subset of the coupling structures (5, 5', 5", 6, 6', 6") to be illuminated by the illumination device in such a manner that the illumination device provides illumination areas (12, 12") of a first selection of colours not constituting all colours of the image , wherein the control unit is configured to select the subset of the coupling structures (5, 5', 5", 6, 6', 6") to be illuminated by the illumination device in such a manner that the illumination device provides illumination areas (12, 12") of a single colour, characterised in that the control unit is configured to receive feedback from the user, when the user has finished inserting beads (4, 4', 4") of a single predefined colour, wherein the control unit is configured to hereafter illuminate coupling structures (5, 5', 5", 6, 6', 6") that have not been illuminated. - a body structure comprising a plurality of coupling structures (5, 5', 5", 6, 6', 6") arranged on a base portion and being configured to receive a building element (4, 4', 4", 7, 7', 9, 9'), - an illuminator which is an illumination device configured to provide illumination of at least a portion of the body structure and hereby provide a number of illumination areas (12, 12"), whereby the system comprises - a control unit configured to be applied to select a subset of the coupling structures (5, 5', 5", 6, 6', 6") and initiate an illumination that enables a unique identification of the selected subset of the coupling structures (5, 5', 5", 6, 6', 6") to be established by means of the illumination wherein - the control unit is configured to select the subset of the coupling structures (5, 5', 5", 6, 6', 6") to be illuminated by the illumination device in such a manner that the illumination device provides illumination areas (12, 12") of a first selection of colours not constituting all colours of the image , wherein the control unit is configured to select the subset of the coupling structures (5, 5', 5", 6, 6', 6") to be illuminated by the illumination device in such a manner that the illumination device provides illumination areas (12, 12") of a single colour, characterised in that the control unit is configured to receive feedback from the user, when the user has finished inserting beads (4, 4', 4") of a single predefined colour, wherein the control unit is configured to hereafter illuminate coupling structures (5, 5', 5", 6, 6', 6") that have not been illuminated. <EOS>