Abstract: Method for assembling a micro-, sub-micro- or nano-scale structure includes the steps of providing a set of cells (1A-5A) designed to assemble into a cell structure (C) in a predetermined order. The set of cells (1A-5A) are brought into contact with at least one seed so that a cell structure (C) grows from the seed(s). Before bringing the set of cells into contact with at least one seed, the method includes the step of mixing the set of cells (1A-5A) with at least one set of size-control-units (1B-11B) designed to assemble into a size-control-structure (U) in the vicinity of the cell(s) structure (C) in a predetermined order. The first set of cells (1A-5A) are also mixed with stop blocks (S) designed to prevent further growth of a cell structure (C) when a particular cell in the cell structure (C) becomes substantially adjacently located to a particular size-control-unit in the size-control-structure (U) by attaching to that particular cell and size-control-unit.-.