Kai and Lucy’s Sprinkler Rainbow

A bright arc flickered in the sprinkler spray, and Kai called, “Lucy, come see!”

His little sister hurried across the warm backyard in her yellow sandals. Kai pointed to the lawn, where the sprinkler spun and sent a fan of water over the grass. For one brief moment, colors curved through the spray—red, yellow, blue, and more.

Lucy leaned close. “Where is it?”

The sprinkler clicked around. Its spray swung to the other side of the lawn, and the colors vanished.

“There!” Kai said. “It was right there!”

Lucy looked where he pointed. She saw only water drops pattering onto the grass.

Kai wanted his sister to see the rainbow before the watering was finished. The sprinkler was already making its steady sh-sh-sh sound, and a thin puddle was growing near the flower bed.

“Maybe it’s hiding,” Lucy said.

“Maybe,” Kai replied. “Let’s look carefully.”

They stood beside the shady porch. The sprinkler turned again, sweeping water past the stepping-stones and toward the garden. Kai spotted a tiny band of color, but it disappeared as soon as Lucy turned her head.

“Did you see it?” he asked.

“I saw the sprinkler,” Lucy said. “But not the rainbow.”

Kai tried pointing faster. “There! No, over there! Wait—now it’s gone.”

Lucy giggled. “It’s playing peekaboo.”

Kai giggled too, but he still wanted her to see it for real. He watched the spray travel back and forth. The rainbow seemed to show up only from certain places. Could the right spot be near the porch? By the flower bed? Or somewhere else on the lawn?

Let’s make a guess with Kai. If Lucy moves, should she stand closer to the sprinkler, farther away, or on the other side of the yard?

Lucy shaded her eyes with one hand and looked across the grass. “I’m going to try over there,” she said, stepping toward the porch’s sunny edge.

The sprinkler clicked. Water swept past her toes, and Kai watched her face closely. For a blink, the colors appeared again—but Lucy was looking the wrong way.

“Wait,” Kai said. “I think I know what we need to change.”

Kai stood still and watched the sprinkler turn. The spray crossed the lawn, then crossed it again. A rainbow flashed when the water was in one part of the yard and vanished when it moved away.

He looked up at the bright afternoon sun. Then he looked at his own shadow, stretching across the grass toward the sprinkler.

“Lucy,” he said, “the sun is behind us. The water is in front of us.”

Lucy turned around to check. “So the sunlight comes over our shoulders?”

“That’s what I think,” Kai said. “Maybe the rainbow only shows when we look through the drops from the right place.”

Sunlight shining through water droplets can make colors appear. For a rainbow in the sprinkler spray, the sun needs to be behind the person looking, with the spray in front. Kai had found the clue.

“Where should we stand next?” he asked. “In the shade, or out on the sunny side of the lawn?”

Lucy pointed to the open grass where the sunlight reached them. “There!”

Kai walked beside her, keeping the sun behind them. They faced the sprinkler, but the spray was still sweeping away from Lucy. She squinted at the water. No rainbow yet.

“Can we turn it toward us?” she asked.

“Let’s try.” Kai carefully nudged the sprinkler base so its sweeping spray would pass across the lawn in front of them. He kept his feet clear of the wet patch, and Lucy stood beside him on the grass.

Click-shhh. The sprinkler swung toward them. A cool mist brushed their cheeks.

“Look!” Kai said.

Lucy stared at the spray. A little arc of color appeared, but then the sprinkler turned and carried the water away. The rainbow slipped out of sight.

Lucy didn’t give up. “It needs to come back this way!”

Together, they made one small adjustment, turning the sprinkler a little so the spray would cross the sunny patch again. Kai checked that the sun was still behind their backs. Lucy watched the moving water, ready this time.

Click. Shhhh. The spray swept in front of them.

“There!” Lucy cried.

A rainbow curved through the droplets, bright and clear. Red rested along its edge, with orange, yellow, green, blue, and violet beside it. Lucy held out her hands, but the colors stayed in the mist, just beyond her fingers.

Kai smiled. “We found the right spot.”

Lucy stood beside Kai as the sprinkler swept its spray across the lawn. This time, she knew where to look. The sun warmed their backs, and the water droplets rose in front of them. Each pass brought the little rainbow into view.

“Hello again, rainbow,” Lucy said.

The sprinkler answered with a steady sh-sh-sh and a tiny click as it changed direction. The colors bent across the spray, then thinned when the water moved on. Lucy watched patiently until the rainbow returned.

“Do you think it knows we found it?” she asked.

“Maybe it likes this spot,” Kai said.

They stood together without trying to chase the colors. A ladybug walked along a blade of grass. Near the porch, a flower nodded under a few drops. The wet lawn smelled fresh, and the warm boards of the porch waited in the shade.

The sprinkler turned more slowly. Its spray made a smaller sweep, sprinkling the grass near the stepping-stones. Kai and Lucy watched the last bright arc appear, stretch across the water, and fade as the droplets fell.

“Was it still a rainbow when it disappeared?” Lucy asked.

“I think the drops just moved out of the right place,” Kai said. “The sunlight and the water have to meet while we’re looking.”

Lucy nodded, as if she were putting that idea away somewhere safe. “Then we can remember where to stand next time.”

The sprinkler gave a final click. A few last drops pattered onto the lawn, and then the spray stopped. The backyard grew quiet. Kai and Lucy walked together to the shady porch, stepping around the damp patch near the garden.

Lucy sat on the top step and leaned against Kai’s shoulder. “My favorite color was green,” she said. “It looked like the grass, but up in the water.”

Kai settled beside her. “Mine was blue.”

They looked out at the lawn, now still beneath its little beads of water. The afternoon stayed warm, and the porch shade rested across their sandals. Lucy traced a rainbow in the air with one finger, starting with green and ending with blue.

Kai followed her little line. Then they sat quietly together, listening to the last drops fall from the leaves.