Surely you recognize the two RC circuits in the circuit diagram shown. If you now connect the battery, the LEDs light up alternately, they blink.
Again you can influence the times the LEDs are light. The times of the LED1 can be influenced by the capacitor C1 and resistor R2 and the LED2 can be influenced by C2 and R3.
Exactly how the circuit works you can find also in the topic about multivibrator. The shown circuit is an astable multivibrator.
This was for now the last experiment in this topic about capacitors.