One Saturday morning, they decided to build the biggest, most block castle ever. They had a huge plastic tub filled with colorful blocks big green rectangles, tall yellow towers, bumpy red squares, and smooth blue triangles.

"I want to build a with a dragon's lair!" Max cheered, grabbing a handful of green blocks.

"No, I want to build a spaceship with rocket boosters!" Leo countered, reaching for the blue triangles.

The arguing started instantly. "My castle will be cooler!" "No, my spaceship will be faster!" Their voices got louder and louder, like popcorn popping in a pan.

Then, the big idea hit them both at the same time.

"We'll see whose creation is best!" Max declared. He began stacking blocks as fast as he could, his brows furrowed in concentration. He didn't even think about what Leo was doing.