Rainbows are beautiful and fun to look at because they seem to just appear out of nowhere. As such, they hold some kind of magical and mysterious quality about them. Scientifically, a rainbow is just an optical illusion.
The rainbow's ability to deliver joy is surely why it’s painted on children's cheeks at school fetes and fun fairs. Why it’s found on birthday cakes and toys. Why it’s featured in stories, poetry, songs and other literature. Why it’s an element of folklore across different nations and cultures, generally signifying a connection to God or the heavens.
This multicoloured arch is believed to be God’s everlasting promise to us and is a symbol of what theologians call God’s common grace - the grace he shows to all mankind.