System comprising a first communication unit, in particular a transmitter, and a second communication unit, in particular a receiver, wherein the first communication unit comprises a controllable lamp which emits light that has been modulated in accordance with a predetermined data stream, wherein the second communication unit comprises a camera, which comprises an optical element and an image sensor, wherein a light-sensitive area of the image sensor comprises a plurality of rows of light-sensitive elements, wherein the image sensor is configured such that the image of the lamp, projected by the optical element onto the light-sensitive area of the image sensor, is imaged in a blurred manner and/or covers more than half of the light-sensitive area and is scanned row by row, in particular such that the image comprises stripes of different brightness and/or such that the brightness characteristic produced transversely to the direction of the rows spatially displays the time characteristic of the data stream, in particular wherein each stripe covers portions of rows in each case, characterised in that the second communication unit comprises a lenticular film which is arranged between the optical element and the first communication unit, wherein the preferential direction of the lenticular film is oriented transversely to a connecting line between the lamp and the optical element, wherein the second communication unit comprises a portable communication device, in particular a smartphone, tablet, smartwatch or laptop comprising a camera, as well as a support unit which comprises a first and a second part (41, 42), wherein the first part is arranged so as to be movable relative to the second part, in particular is arranged so as to be rotatable, pivotable and/or displaceable, wherein the portable communication device is supported in the first part and the lenticular film is supported in the second part. wherein the first communication unit comprises a controllable lamp which emits light that has been modulated in accordance with a predetermined data stream, wherein the second communication unit comprises a camera, which comprises an optical element and an image sensor, wherein a light-sensitive area of the image sensor comprises a plurality of rows of light-sensitive elements, wherein the image sensor is configured such that the image of the lamp, projected by the optical element onto the light-sensitive area of the image sensor, is imaged in a blurred manner and/or covers more than half of the light-sensitive area and is scanned row by row, in particular such that the image comprises stripes of different brightness and/or such that the brightness characteristic produced transversely to the direction of the rows spatially displays the time characteristic of the data stream, in particular wherein each stripe covers portions of rows in each case, characterised in that the second communication unit comprises a lenticular film which is arranged between the optical element and the first communication unit, wherein the preferential direction of the lenticular film is oriented transversely to a connecting line between the lamp and the optical element, wherein the second communication unit comprises a portable communication device, in particular a smartphone, tablet, smartwatch or laptop comprising a camera, as well as a support unit which comprises a first and a second part (41, 42), wherein the first part is arranged so as to be movable relative to the second part, in particular is arranged so as to be rotatable, pivotable and/or displaceable, wherein the portable communication device is supported in the first part and the lenticular film is supported in the second part.