Everything blue

The bird was blue.
Everything was blue.
Douglas couldn't believe it. One minute, all is as they should be. A red birds, the green grass, a warm yellow sun.
Then everything had turned blue in a blink.
"Why is everything red?" Claret asked, her voice pitched higher than normal as she stared. Douglas frowned and shook his head.
"Nothing is red. Everything is blue." He said, frowning deeper as he noticed the other people in the park.
They all seemed to be arguing with whoever was closest to them. As he focused on the closest couple, their voices rose.
"- yellow!"
It's green!"
Turning back to Claret, Douglas shook his head again. Whatever was going on, it looked to have affected everyone in the park. "We need to find the source." He said.
Claret took in a breath, hands clenched to her chest. "What makes you think this has a source?"
"Everything has to start somewhere. This can't be any different." He said, pushing away his doubts.
If this didn't have a source, if it was just a random phenomenon, then he would never see any other color again.
It was enough to make him feel blue.
"Come on," Douglas waved as he started walking.
Claret hurried after him, and slipped her hand around his.
And explosion of red filled his vision.
The red bird was back!
And that kid's backpack, it had a red stripe!
Douglas heard Claret gasp, and turned to her.
Red hair,
Beautiful, wonderful red hair.
"Your eyes," Claret stared at him, "they're blue."