Necessity, Convenience, Luxury

Necessity first suggested a stool,
Convenience made armchair, as we had all tool,
And luxury brought sofa, invented by a fool.

The same necessity was for light,
Convenience next suggested bulbs for night,
Luxury? It made possible to waste Earth's might.

To hunt, we made spear, an idea so dizzy,
So, we came up with gun to make the killing easy,
To save time, we have nuclear now, as our life is busy.