How to create a simple circuit that makes an LED blinking continuously ?

How to create a simple circuit that makes an LED blinking continuously ?  - The special thing about this circuit is that both transistors are either conducting or both are blocking. As long as the lamps are not lit, only small currents flow, that benefits the battery. A further advantage of this circuit is that only a single capacitor determines the flashing frequency.the benefits of this circuit can be used for tower lights or tower antennas.

Reference : Elektor Electronics