A fluidic device for developing a cellular starting material into a three-dimensional cellular construction, comprising a base body with a chamber extending in an x-direction, a y-direction being orthogonal to the x-direction and a z-direction being orthogonal to the x-direction and the y-direction, in which a matrix is accommodated or can be accommodated, into which the starting material to be developed can be introduced; and at least two fluid reservoirs, wherein each of the at least two fluid reservoirs comprises: a fluid inlet for introducing a fluid medium into the corresponding fluid reservoir, a fluid outlet for draining the fluid medium from the corresponding fluid reservoir, and a separating means being partially permeable for the fluid medium, which separates the corresponding fluid reservoir from the chamber and forms a common planar interface of the corresponding fluid reservoir with the chamber, via which the fluid medium can diffuse into the matrix; wherein the fluidic device is configured to form, when suitable fluid media are used, at least one concentration gradient, at least two concentration gradients being orthogonal to each other and/or at least two concentration gradients being antiparallel to each other (X1, X2, Y1, Y2) in the matrix, which each are substantially homogeneous or purposefully inhomogeneous over at least a section of the extension of the matrix in the z-direction, provided that two of the separating means (18A, 18B) each extend in the z-direction and the x-direction and are arranged opposite from each other and are spaced apart from one another in the y-direction by the chamber, and/or provided that two more of the separating means (18C, 18D) each extend in the z-direction and the y-direction and are arranged opposite from each other and are spaced apart from one another in the x-direction by the chamber. a chamber extending in an x-direction, a y-direction being orthogonal to the x-direction and a z-direction being orthogonal to the x-direction and the y-direction, in which a matrix is accommodated or can be accommodated, into which the starting material to be developed can be introduced; and at least two fluid reservoirs, wherein each of the at least two fluid reservoirs comprises: a fluid inlet for introducing a fluid medium into the corresponding fluid reservoir, a fluid outlet for draining the fluid medium from the corresponding fluid reservoir, and a separating means being partially permeable for the fluid medium, which separates the corresponding fluid reservoir from the chamber and forms a common planar interface of the corresponding fluid reservoir with the chamber, via which the fluid medium can diffuse into the matrix; wherein the fluidic device is configured to form, when suitable fluid media are used, at least one concentration gradient, at least two concentration gradients being orthogonal to each other and/or at least two concentration gradients being antiparallel to each other (X1, X2, Y1, Y2) in the matrix, which each are substantially homogeneous or purposefully inhomogeneous over at least a section of the extension of the matrix in the z-direction, a fluid inlet for introducing a fluid medium into the corresponding fluid reservoir, a fluid outlet for draining the fluid medium from the corresponding fluid reservoir, and a separating means being partially permeable for the fluid medium, which separates the corresponding fluid reservoir from the chamber and forms a common planar interface of the corresponding fluid reservoir with the chamber, via which the fluid medium can diffuse into the matrix; provided that two of the separating means (18A, 18B) each extend in the z-direction and the x-direction and are arranged opposite from each other and are spaced apart from one another in the y-direction by the chamber, and/or provided that two more of the separating means (18C, 18D) each extend in the z-direction and the y-direction and are arranged opposite from each other and are spaced apart from one another in the x-direction by the chamber.