This animation from TED-Ed explains the importance of symmetry in science and biology. This probably isn't something you've ever thought about - which is why it's such a fascinating video.
The video explains bilateral vs. radial symmetry, plant symmetry, animal symmetry, and how some animals have no symmetry at all (coral). This is all important in the study of developmental biology.
Kelleher doesn't mention this in the video, but studies have shown that in humans, one of the prime elements of attraction that individuals have for others is the symmetry of their faces. Yes, it really is that simple.
As with all TED-Ed animations, this one goes quickly from the simple to the complex and provides a little bit of everything on the topic.
From the youtube page:
When you hear the word symmetry, you might think generally of triangles, butterflies, or even ballerinas. But defined scientifically, symmetry is "a transformation that leaves an object unchanged." Huh? Colm Kelleher unpacks this abstract term and explains how animal's distinct symmetries can tell us more about them -- and ourselves.
Lesson by Colm Kelleher, animation by Andrew Foerster.