Illusions

Could these be bold Pirate ships, I see,
Through a strange mist, rolling from the sea?

Could these be alien space-ships, I spy,
High up in the deep-blue arc of the sky?

Could these be quaint fairy-folk, perchance,
Flitting through the trees in a merry dance?

Could these be illusions, not quite what they seem?
Could these be, only, a mystical dream?