Railings display shadows

These perimeter railings,
Around my veranda,
Offer some unique images,
Under the influence of sunlight,
With their shadows,
Which they cast on the floor, According to their shapes.

But, everyone knows,
When the sunlight goes away,
These shadow images will vanish, Waiting for another sunlight,
Before appearing again.
This is so because,
It is light that gives life to shadows.