A chromatic reflective unit comprising: a support structure comprising a plurality of non-coplanar surface sections, a reflective layer formed on the plurality of non-coplanar surface sections, thereby forming a plurality of non-coplanar reflective surface sections, respectively associated with one of the plurality of non-coplanar surface sections, and a chromatic diffusing layer having a back side provided at the reflective surface sections and a front side for being illuminated by incident light, wherein the chromatic diffusing layer comprises a plurality of nanoparticles embedded in a matrix, and wherein the reflective layer and the chromatic diffusing layer are configured to provide for a specular reflectance that is larger in the red than in the blue and for a diffuse reflectance that is larger in the blue than in the red, wherein a difference in the refractive index of the nanoparticles with respect to the refractive index of the matrix, a size distribution of the nanoparticles, and a number of nanoparticles per unit surface area are selected to provide for the specular reflectance that is larger in the red than in the blue and for the diffuse reflectance that is larger in the blue than in the red, wherein a shape associated with the plurality of non-coplanar reflective surface sections is characterized by a variation in a distance (d) to a reference plane that is measured along a straight measurement line (y) extending along the reference plane, wherein the reference plane is coplanar with respect to a central plane of the plurality of non-coplanar reflective surface sections, the central plane has a diffusing layer side and a reflector side, the reference plane is displaced from the central plane at the diffusing layer side beyond any one of the plurality of non-coplanar reflective surface sections, and the variation in the distance (d) comprises at least three local extrema, and the distance (d) increases and decreases at least twice along the measurement line (y). a support structure comprising a plurality of non-coplanar surface sections, a reflective layer formed on the plurality of non-coplanar surface sections, thereby forming a plurality of non-coplanar reflective surface sections, respectively associated with one of the plurality of non-coplanar surface sections, and a chromatic diffusing layer having a back side provided at the reflective surface sections and a front side for being illuminated by incident light, wherein the chromatic diffusing layer comprises a plurality of nanoparticles embedded in a matrix, and wherein the reflective layer and the chromatic diffusing layer are configured to provide for a specular reflectance that is larger in the red than in the blue and for a diffuse reflectance that is larger in the blue than in the red, wherein a difference in the refractive index of the nanoparticles with respect to the refractive index of the matrix, a size distribution of the nanoparticles, and a number of nanoparticles per unit surface area are selected to provide for the specular reflectance that is larger in the red than in the blue and for the diffuse reflectance that is larger in the blue than in the red, wherein a shape associated with the plurality of non-coplanar reflective surface sections is characterized by a variation in a distance (d) to a reference plane that is measured along a straight measurement line (y) extending along the reference plane, wherein the reference plane is coplanar with respect to a central plane of the plurality of non-coplanar reflective surface sections, the central plane has a diffusing layer side and a reflector side, the reference plane is displaced from the central plane at the diffusing layer side beyond any one of the plurality of non-coplanar reflective surface sections, and the variation in the distance (d) comprises at least three local extrema, and the distance (d) increases and decreases at least twice along the measurement line (y).