YV 3.5b

If he desire of a man, 'May he possess cattle', he should put down for him the water (bricks) and then put down the strengthening (bricks); verily he makes concord for him with cattle and he becomes possessed of cattle. He puts down four in front; therefore the eye has four forms, two white, two black [4]. The (verses) contain the word 'head'; therefore the head (of the fire) is in front. Five he puts down in the right hip, five in the left; therefore the animal is broader behind and receding in front; 'The goat in strength', (with these words he puts down) on the right shoulder; (with) 'The ram in strength', on the left; verily he puts together the shoulders (of the fire). 'The tiger in strength', (with these words) he puts down in the right wing, (with) 'The lion in strength' on the left; verily he gives strength to the wings. (With) 'The man in strength' (he puts down) in the middle; therefore man is overlord of animals. 'O Indra and Agni, (the brick) that quaketh not', (with these words) he puts down the naturally perforated (brick); these worlds are separated by Indra and Agni; (verily it serves) to separate these worlds. Now the middle layer is, as it were, insecure, it is as it were the atmosphere; 'Indra and Agni', he says; Indra and Agni are the supporters of force among the gods; verily he piles it with force in the atmosphere, for support. He puts down the naturally perforated (brick); the naturally perforated (brick) is the atmosphere; verily he puts down the atmosphere [1]. He makes the horse sniff it; verily he puts breath in it; now the horse is connected with Prajapati; verily by Prajapati he piles the fire. It is a naturally perforated (brick), to allow the passage of the breaths, and also for the lighting up of the world of heaven.