Display

The butterfly tilted her head. "Numbers can be shy. They don't always like to tell their story right away. But I can help." She took a tiny step forward. "I am Display. The skill I teach is *visualization*."

"Vizu-what?" I asked.

"*Visualization*," she repeated. "It’s a big word for a simple idea. We turn numbers into pictures. The right picture shows you the pattern instantly."

From one of her vest pockets, she pulled out a tiny pencil and a blank card that looked like a grid. "Your numbers tell a story about something that changes over time. For that, you want a line graph."

"A line graph?"

"It's a special kind of picture," Display explained. "It uses a line to connect dots. It shows you if things are going up, down, or staying the same."

She drew two lines, one along the bottom and one up the side. Along the bottom, she wrote the days of the week. Up the side, she wrote numbers for the acorns.

Then she started making dots. "On Monday, you found five acorns." She put a dot above 'Monday' across from the number 5. "On Tuesday, three." She made another dot. She kept going, for Wednesday, Thursday, and Friday.

The dots were scattered on the page. They still looked like a jumble to me.

"Now for the magic," Display whispered. She carefully drew a line connecting the dots, from the first to the last.

Suddenly, I saw it. The line dipped a little at the start, but then it climbed. And climbed. And climbed.

"Whoa!" I said. "The line goes up! I am getting better!"

Display smiled, a tiny, happy smile. "See? The picture tells the story. The numbers were telling you that all along. They just needed the right graph to help them say it."

I stared at the line graph. It was so simple. So clear.

"What about this?" I asked, flipping to another page in my notebook. "My friends and I voted on our favorite bugs."

Spiders: 4 votes Ladybugs: 7 votes Beetles: 2 votes

"Would a line graph work for that?"

Display shook her head. "A line graph is for tracking one thing over time. Here, you're comparing different groups. For that, you need a different kind of picture."

She pulled out another card. "For this, you want a bar chart."

"What's that?"

"A bar chart uses blocks, or bars, to show how much of something you have," she said. "The taller the bar, the more you have. It's great for comparing things."

She drew the names of the bugs along the bottom of the card. Then, above 'Spiders,' she drew a bar that went up to the number 4. She drew a short bar for 'Beetles' that only went up to 2. And for 'Ladybugs,' she drew a tall bar that went all the way up to 7.

It was even clearer than the line graph. The ladybug bar was a skyscraper. The beetle bar was a tiny hut.