1. A videoconferencing device configured to enable a videoconference between a local user and at least one remote user, the device comprising: a local image sensor capable of capturing a non-delayed local image of the local user to transmit to the remote user as a transmitted local image; a delaying unit capable of applying a chosen delay to the non-delayed local image of the local user generated by the local image sensor to produce a delayed local image such that a timing, at the local user of the delayed local image is same as a timing, at the remote user, of the transmitted local image; a superimposing unit configured to superimpose the non-delayed local image with the delayed local image to produce a superimposed image; and a screen configured to simultaneously display to the local user an image of the remote user and the superimposed image containing the non-delayed local image and the delayed local image such that discrepancies between the non-delayed local image and the delayed local image are visible to the local user.