Symmetry essentially reflects order. It is fascinating that so few animals are asymmetrical and indeed, most are bilaterally symmetrical like humans. Than (2005) notes that “bilateral symmetry is so prevalent in the animal kingdom that many scientists think that it can't be a coincidence. After all, there are infinitely more ways to construct an asymmetrical body than a symmetrical one. And yet, fossilized evidence shows that bilateral symmetry had already taken hold in animals as early as 500 million years ago.”
It is noteworthy that scientists recognize that an object’s symmetry relates to its aesthetic appeal, and that humans are particularly attracted to symmetry. The symmetry of animals no doubt contributes to their aesthetic appeal. One plausible explanation for this could be the innate desire of humans for harmony and unity. Another could relate to how one experiences joy. Unification Thought recognizes that the joy humans can experience from an object is greater the more similar the object is to a human. That is, they received joy from an actual painting (substantial) moreso than the thought of a painting (insubstantial), from a monkey more than from a fish, and most from other human beings. It would stand to reason that human beings, as organisms with bilateral symmetry, would find joy in other bilaterally symmetrical animals.