What do all of these things have in common?
The answer is a simple word or phrase.
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They all reflect the concept of time.
A lightbulb is a symbol of the humanity's progress through time; it's an artificial image of sun, the one thing that guides us through the day.
A forest is a unit of time, 17 seconds or so.
The hole in the tree is a circle, quite like a clock. That wood, when put vertically, has a shadow that tells us the time.
Number 12, midnight and noon.
A pool has water, and water moves, just like time.
Fruits take time to be edible.
The ocean has waves, the foundation of this world is in waves, yet time lives outside of that.
Bills have to be paid on time.