A procedure for duplicating a Quick Response QR code on a target element for obtaining a coded three-dimensional object OC (3; 3'), comprising: - an initial step of writing of said code QR, adapted to code the desired content into the two-dimensional matrix representative of said QR code, characterised in that it further comprises at least the following steps, subsequent to said initial writing step: - implementing said QR code in a three-dimensional space S3D, adapted to house said target element, - duplicating said QR code on said target element, up to obtaining said OC (3; 3'), - reading said OC (3; 3'), for decoding said same desired content, coded in said QR code, when read according to the same axonometric perspective by which said QR code has been implemented in said S3D, and in that said step of duplicating said QR code on said target element comprises at least the following steps: - reconstructing and/or reprocessing said QR code in said S3D through sequential activities of selection and positioning of suitable three-dimensional elements (E1, E2,... EN) as a replacement of predetermined black code or white code portions of said QR code, said three-dimensional elements (E1, E2,... EN) having such shape, dimension and colour features as to be decoded as compatible and prospectively correspondent with said predetermined black code or white code portions replaced, so that the decoding of the OC (3; 3') provides the same content coded in said QR code, - removing said black code or white code portions at the end of each of said sequential activities of selection and positioning of said three-dimensional elements (E1, E2,... EN), provided that said three-dimensional elements (E1, E2,... EN) are effectively recognised as suitable, said suitability assessment operating continuously during each of said sequential activities, - obtaining said OC (3; 3'), consisting of said target element on which said QR code is reconstructed and/or reprocessed in the S3D. - an initial step of writing of said code QR, adapted to code the desired content into the two-dimensional matrix representative of said QR code, - implementing said QR code in a three-dimensional space S3D, adapted to house said target element, - duplicating said QR code on said target element, up to obtaining said OC (3; 3'), - reading said OC (3; 3'), for decoding said same desired content, coded in said QR code, when read according to the same axonometric perspective by which said QR code has been implemented in said S3D, - reconstructing and/or reprocessing said QR code in said S3D through sequential activities of selection and positioning of suitable three-dimensional elements (E1, E2,... EN) as a replacement of predetermined black code or white code portions of said QR code, said three-dimensional elements (E1, E2,... EN) having such shape, dimension and colour features as to be decoded as compatible and prospectively correspondent with said predetermined black code or white code portions replaced, so that the decoding of the OC (3; 3') provides the same content coded in said QR code, - removing said black code or white code portions at the end of each of said sequential activities of selection and positioning of said three-dimensional elements (E1, E2,... EN), provided that said three-dimensional elements (E1, E2,... EN) are effectively recognised as suitable, said suitability assessment operating continuously during each of said sequential activities, - obtaining said OC (3; 3'), consisting of said target element on which said QR code is reconstructed and/or reprocessed in the S3D.