Sacred Geometry

Sacred geometric perfect square or four square
measured by the geometer Jesus.

Sacred Geometry
is the geometry of the cosmos whereby the geometer is Jesus, and in which symbolic and sacred meanings are assigned to specific geometric shapes and geometric proportions.
Sacred geometry ascribes symbolic and sacred meanings to certain geometric shapes and certain geometric proportions. It is associated with the belief that a god is the geometer of the world. Wikipedia.
Jesus is the creator of the world, and the universe was created through the instrument of sacred geometry. The created universe is the new heaven and the new earth.
And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away. (Revelation 21:1) "KJV"
Universe = Heaven and Earth
New Universe = New Heaven and New Earth

A new heaven and a new earth: new universe
The first heaven and the first earth: old universe
The first heaven and the first earth were passed away: the old universe ended

Jesus used sacred geometry to create a new cosmos after the end of the old universe. As the geometer, he had his measuring instrument:
And he that talked with me had a golden reed to measure the city, and the gates thereof, and the wall thereof. (Revelation 21:15) "KJV"

He that talked with me: Jesus
Golden measuring reed: precious measuring instrument

"He that talked with me had a golden reed to measure" describes Jesus as a geometer holding in his hand a measuring instrument.

Jesus measured in two dimensions, creating a perfect square:
And the city lieth foursquare, and the length is as large as the breadth. (Revelation 21:16) "KJV"

A Square = 4 (Four Sides)
Perfect Square = 4(Four Square)
                         = 4 × 4
                      = 16 (16 sides)

Jesus measured in equal length and equal breadth to produce a plane shape:
The length is as large as the breadth. (Revelation 21:16) "KJV"

The product of this measurement is a square - made up of four smaller squares. The length (the vertical line) and the breadth (the horizontal line) intersect at the middle to form a cross. The cross divides the large square such that it is divided into four smaller squares. The magnitude of the cross is equal to 16.

The cross is the two dimensional representation of the Holy City (the New World), the square is the geometric shape, and '4 by 4' (4 × 4 = 16)  is the geometric proportion.

Apart from the square, Jesus used other geometric shapes like triangle, hexagon, octagon, pentagon, and circle to create the cosmos called heaven or paradise.
As late as Johannes Kepler (1571 - 1630), a belief in the geometric underpinning of the cosmos persisted among some scientists. Wikipedia