The defining feature of a black hole is the appearance of an event horizon – a boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole. Nothing, not even light, can escape from inside the event horizon. The shape of the event horizon of a black hole is always approximately spherical. Click here to view the first image in this week’s funny work pictures gallery. Continue reading for a viral video of the best little dancer you will see this week.