I was considering what to make according to the plot "I want to put the spotlight on NE555 which is the main character and express its function simply and elegantly".
When I researched the specification of NE555, I found that I could configure the on/off timer with a very simple circuit, so I decided to illuminate NE555 with LED and control the LED itself with NE555. The simple circuit itself is wired in the air to make it a part of the design, and the resistors and diodes used for control are replaceable to express the function as a minimal installation.

The overall structure consists of D0.8mm brass for Vcc and GND, and D0.5mm brass wire for the rest of the circuit.
Capacitors and LEDs are placed in consideration of the overall design balance.