A reflection light grid comprising a plurality of light transmitters (S1, S2, S3, S4, S5, S6) and a plurality of light receivers (E1, E2, E3, E4, E5, E6) in a housing; - and an oppositely disposed retroreflective reflector that reflects incoming light beams back in parallel with their angle of incidence, - wherein the retroreflective reflector has at least one first section and has at least one second section; - wherein a first light transmitter, a first light receiver, and the first section of the reflector form a first reflection light barrier and a second light transmitter, a second light receiver, and the second section of the reflector form a second reflection light barrier, characterized in that - the first section and the second section have different polarization properties; - a first polarization filter having a first polarization direction is arranged in front of the first light transmitter; and - a second polarization filter having a second polarization direction is arranged in front of the second light transmitter; - a third polarization filter having a third polarization direction is arranged in front of the first light receiver; and - a fourth polarization filter having a fourth polarization direction is arranged in front of the second light receiver, - with the first polarization direction of the first polarization filter and the polarization direction of the second polarization filter differing; and - with the third polarization direction of the third polarization filter and the fourth polarization direction of the fourth polarization filter differing; - and in that the light transmitters (S1, S2, S3, S4, S5, S6) are arranged directly adjacent in a row and the light receivers (E1, E2, E3, E4, E5, E6) are arranged in parallel with the light transmitters (S1, S2, S3, S4, S5, S6) directly adjacent in a row; - or in that the light transmitters (S1, S2, S3, S4, S5, S6) and the light receivers (E1, E2, E3, E4, E5, E6) are each arranged in two rows, with the light transmitters (S1, S2, S3, S4, S5, S6) and the light receivers (E1, E2, E3, E4, E5, E6) alternating and each light receiver (S1, S2, S3, S4, S5, S6) of the one row having a light receiver (E1, E2, E3, E4, E5, E6) of the other row associated with it. - and an oppositely disposed retroreflective reflector that reflects incoming light beams back in parallel with their angle of incidence, - wherein the retroreflective reflector has at least one first section and has at least one second section; - wherein a first light transmitter, a first light receiver, and the first section of the reflector form a first reflection light barrier and a second light transmitter, a second light receiver, and the second section of the reflector form a second reflection light barrier, - the first section and the second section have different polarization properties; - a first polarization filter having a first polarization direction is arranged in front of the first light transmitter; and - a second polarization filter having a second polarization direction is arranged in front of the second light transmitter; - a third polarization filter having a third polarization direction is arranged in front of the first light receiver; and - a fourth polarization filter having a fourth polarization direction is arranged in front of the second light receiver, - with the first polarization direction of the first polarization filter and the polarization direction of the second polarization filter differing; and - with the third polarization direction of the third polarization filter and the fourth polarization direction of the fourth polarization filter differing; - and in that the light transmitters (S1, S2, S3, S4, S5, S6) are arranged directly adjacent in a row and the light receivers (E1, E2, E3, E4, E5, E6) are arranged in parallel with the light transmitters (S1, S2, S3, S4, S5, S6) directly adjacent in a row; - or in that the light transmitters (S1, S2, S3, S4, S5, S6) and the light receivers (E1, E2, E3, E4, E5, E6) are each arranged in two rows, with the light transmitters (S1, S2, S3, S4, S5, S6) and the light receivers (E1, E2, E3, E4, E5, E6) alternating and each light receiver (S1, S2, S3, S4, S5, S6) of the one row having a light receiver (E1, E2, E3, E4, E5, E6) of the other row associated with it.