Abstract: A building element for a building constructional set comprising top face, a plurality of side walls extending downwardly from the top face, a plurality of coupling studs which are arranged on the top face in a two-dimensional periodical pattern, a plurality of cavities arranged in a two-dimensional periodical pattern between the side walls to receive the coupling studs in frictional engagement and at least one color indicator which is in form of spatially distributed raised points of the same shape and is part of the building element for the purpose of indicating the color of at least one surface area of the building element. Different spatially distribution of raised points of the same shape indicates different colors. The color indicator may also represents the type/strength of shade of the color of at least one surface area of the building element.

Abstract: A building element for a constructional building comprising a top face, a plurality of side walls extending downwardly from the top face, a plurality of coupling studs which are arranged on the top face, a plurality of cavities arranged in a two-dimensional periodical pattern between the side walls to receive the coupling studs in frictional engagement and at least one color indicator which is part of the building element and indicates the color of at least one surface area of the building element. The color indicator is a symbol or a model of a real object. The color indicator also represents the shade of the color of the building element. The color indicator is a three dimensional space positioned within the the external surface of the said building element or is a three dimensional protruding structure positioned on the external surface of the building element or is printed on the external surface of the building element.

Abstract: A constructional building element comprising a top face, a plurality of side walls extending downwardly from the top face, a plurality of coupling studs which are arranged on the top face, a plurality of cavities arranged in a two-dimensional periodical pattern at the bottom of the building element to receive coupling studs in frictional engagement and at least one container with opaque external surface and opening to accomadate favorite objects which cannot be easily joined. The object container with opaque external surface can be frictionally releasable from the building element. The object container with opaque external surface accomodates a surface area with coupling studs/cavities to frictionally engage with favorite objects. The building element may accommodate multiple containers with opaque external surfaces. The object container with opaque external surface may have tray to accommodate favorite objects.

Abstract: Delegatee of a task in workflow system receives data related to task to be performed. This invention realizes a method and system which provides capability to the said delegatee to initiate the process of modifing to tasks which resemble the task delegated to the delegatee. This capability given to the delegatee to initiate the process of modification of resembling tasks is realized by creating a modification task data which includes rules which identifies the resembling tasks in the workflow system; information regarding proposed modification to the resembling tasks in the workflow system and information which identifies the delegatee of the modification task data.