1) Two video interpretations of Psalm 133, showing the diversity in the world wide Christian community:
From the cradle of civilization, Africa, we have:
From the Church of Harley-Davidson:

2) Psalm 133 (New International Version)

A song of ascents. Of David

1 How good and pleasant it is when bothers love together in unity!

2 It is like precious oil poured on the head, running down on the beard, running down on Aaron’s beard, down upon the collar of his robes.

3 It is as if the dew of Hermon were falling on Mount Zion.  For there the Lord Bestows his blessing, even life forevermore.

3) How do these words guide you?
From a commentary by Adam Clark:

Verse 1. Behold, how good and how pleasant – Unity is, according to this scripture, a good thing and a pleasant; and especially among brethren-members of the same family, of the same Christian community, and of the same nation. And why not among the great family of mankind? On the other hand, disunion is bad and hateful. The former is from heaven; the latter, from hell.

Verse 2. Like the precious ointment – The composition of this holy anointing oil may be  seen,  sweet cinnamon, sweet calamus, cassia lignea, and olive oil (Exod. xxx. 23). The odour of this must have been very agreeable, and serves here as a metaphor to point out the exquisite excellence of brotherly love.

Ran down upon the beard – The oil was poured upon the head of Aaron so profusely as to run down upon his garments. It is customary in the east to pour out the oil on the head so profusely as to reach every limb.

Verse 3. As the dew of Hermon – and as the dew that descended upon the mountains of Zion – This was not Mount Zion, wyx tsiyon, in Jerusalem, but Sion, ay which is a part of Hermon, see Deut. iv. x18: “Mount Sion, which is Hermon.” On this mountain the dew is very copious. Mr. Maundrell says that “with this dew, even in dry weather, their tents were as wet as if it had rained the whole night” This seems to show the strength of the comparison.

For there – Where this unity is. The Lord commanded the blessing. That is, an everlasting life. There he pours out his blessings, and gives a long and happy life.

4. Brotherhood and unity are precious words we need to immerse ourselves in it as completely as the oil running down Aaron’s beard.

We are blessed in every moment we live in peace with our brothers (and sisters).

The challenge is to extend our definition, in how we live, beyond what most define as their family.  This is the guidance in the Bible, and is also evidenced by science in the human genome.  We all are actually blood relatives.

The better we live in unity, not discord, the more moments of joy we will feel.