This is a picture of God measuring with His calipers.
It is referred to in Daniel 7:
9 "As I looked,
"thrones were set in place,
and the Ancient of Days took his seat.
His clothing was as white as snow;
the hair of his head was white like wool.
His throne was flaming with fire,
and its wheels were all ablaze.
10 A river of fire was flowing,
coming out from before him.
Thousands upon thousands attended him;
ten thousand times ten thousand stood before him.
The court was seated,
and the books were opened.
