A Youtube channel has just uploaded a video proposing a challenge. The question is pretty simple. It can be summed up to: A clock is moving towards you at 50% the speed of light, and eventually it passes you and continues its travel. When the clock is moving towards you, will it appear to tick faster, slower, or at the same rate than when it is moving away from you? Watch from 0:47 or so. Attempt at a solution It seems to me that yes, the clock will be ticking at the same rate. Afterall, the velocity is the same and the speed of light is absolute (that means, when the clock is approaching you, it won't make light travel faster towards your eyes). So, can you help? It's worth a t-shirt.