Arguably everything posted on Instagram is a distortion of reality (especially if you're a celebrity), but a video shared this week by the science account Physicsfun truly tests the laws of optics.

It is a shape that you will never see in everyday life, which is a combination of a right angle like a key bracket and a lightning-shaped arrow. There is a theory that this symbol is 'a symbol ...

Space to play or pause, M to mute, left and right arrows to seek ... The plural for vertex is vertices. The angle is this bit the space where two rays meet. This is usually represented by ...