Namkha form of the Endless knot of Ashtamangala, is a Tibetan Buddhist name of a coloured thread cross made of coloured silk or wool threads wrapped around sticks.
Ngak'chang Rinpoche said the threads "describe the manner in which each point in time and space is the warp and weft of the loom of experiential/existential emptiness."
Namkha is called sky-weaving because it is formed from weaving space and time to form spacetime, as asserted by Ngak'chang Rinpoche.
Spacetime is the axis mundi where Earth and sky meet. Earth and sky are weft and warp woven together to form the fabric called Namkha.
The geometry of space-time described by Einstein's theory of General Relativity is a fabric or a woven cloth in which the vertical lines are warp and the horizontal lines are weft. It is a net (a network) of people and things, and the cosmos (the tree of life) present in different cultures, religions, subjects and places.
Who stretches out the heavens like a curtain, and spreads them out like a tent to dwell in. (Isaiah 40:21-22) "NKJV"
Weaving warp and weft to form Namkha is uniting all people and all things to form cosmos. Namkha is the new Jerusalem (the holy city or the holy of holies).
The LORD wraps himself in light as with a garment; he stretches out the heavens like a tent. (Psalm 104:2) "NIV"
Heavens: spacetime in different religions, subjects, places and things.
Uniting the knowledge of the holy city from different parts of the world to form Namkha is bringing the wealth of wisdom of the nations into the holy city.
Tibet is the extreme and end of the world, and the point where humans climb from earth to heaven. Namkha is a thread reaching from the sky to the earth, and climbing to the top of Mount Everest is symbolic is symbolic of climbing the thread into heaven.
Mount Everest is the physical sign of the umbilical cord connecting, such that climbing to the peak of the Mountain is symbolic of levitation and rapture into heaven. It is the act of lifting up and rising from the earth into heaven.
Mount Everest is the sign post of the end, summit and peak of the world. Arriving at the knowledge of the axis mundi in Tibet is exhausting the spiritual (virtual) journey from earth to heaven.
Mankha has five colours, blue, green, red, white and yellow, corresponding to the five elements which are the five Platonic Solids. Weaving the threads together is uniting the Platonic Solids to form the geometry of the cosmos.
Namkha is Aether, which stands for heaven or sky. Spacetime, the sum of space and time, is equal to heaven because earth is equal to void or emptiness at the axis mundi.
Ascending into heaven implies giving up the old world in order to enter into a harmonious new world, which is the basis of monastic life in Tibet.
Buddhist monks give up everything in life to demonstrate how the earth and everything that is in it are worthless and amount to nothing, null and void at the point of ascension into heaven (the cosmos).
Heaven, the time component of spacetime, is a dodecahedron called Aether. In spacetime, space is equal to zero (Wuji) and time is Taiji (Namkha) because the earth is considered destroyed at the point of entry into heaven.
In Namkha, the network of squares representing spacetime are concentric squares of different colours representing unity in diversity. The diverse colours stand for diversity and the single square comprised of many squares stands for unity.
Therefore, Namkha is the symbol of balance, global peace and harmony.