They are thinking, "We are making progress. We are making progress. We are bringing stones and irons on head and putting together, and it is progress. We are very happy." (laughter) This is going on.
This is called bahir-artha-māninaḥ (SB 7.5.31). They are enamored by the external energy of the Personality of Godhead. These material things are products of the external energy of the Lord. Bhūmir āpo 'nalo vayuḥ khaṁ buddhir mano eva (BG 7.4). Bhūmi, the earth—the iron, stone, wood, they are nothing but transformation of earth. Similarly, vapo, water. So whatever we are manufacturing here, they are simply combination of earth, water, air, fire, that's all. Nothing but. Tejo-vāri-mṛdāṁ vinimayam (SB 1.1.1). Vinimaya, exchange of teja, fire. Teja means fire, vāri means water, and mṛd means earth. Just like the bricks. What is this brick? You take earth, you take earth and mix it with water and put it in the fire, it becomes brick. So whole thing, either earth, stone or iron, anything, they are simply mixture of these five elements.
So I am spirit soul. I have been engaged in mixing these five things and big, big lumps, and gathering them just like children play in the sea beach, gathering so much sand and making like this, big house, and then it is fallen down. So we are engaged in these material activities, but we forget at the same time that there is, ready, atom bomb. As soon as there will be declared war, these things will be finished, immediately.