What do we call visible light? We call it color. But the electromagnetic spectrum runs to zero in one direction and infinity in the other, so really, children, mathematically, all of light is invisible.
No ray of sunshine is ever lost,
but the green which it awakens
into existence
needs time to sprout,
and it is not always granted
for the sower to see the harvest.
.
All work that is worth anything is done
in faith.