In April 1990, a photo of a triangular object upon which three lights are visible at each corner was taken by Patrick M. Since then, Patrick M. came out and stated publicly that the picture was a hoax by him.[5] Skeptics say there is no background in the photograph and no element that would allow calculation of the object's size or distance from the camera. Wim van Utrecht, a Belgian skeptic, has reproduced a copy of the photograph with devices. A computer graphics simulation method[6] to reproduce the photograph was developed by a Belgian mathematician, Thierry Veyt at The University of Liège Laboratory of Astrophysics, wherein the apparent "shake" motion, that results in the lights of the craft appearing blurred or out of focus in the photograph contradicts eye-witness statements. This, along with the anonymity of the photographer and fact that the image was not produced publicly until 4 months after the alleged event, brings the authenticity of the image into question. For 20 years, the ufological organization Société belge d'étude des phénomènes spatiaux (SOBEPS) claimed that this picture was genuine. But on 26 July 2011, in an interview for RTL, a Belgian TV channel, Patrick M. confessed that it was a hoax.[4][7]