"Well," Lucky finally said, "what's the deal with the sign?"
"Did you read it?" Lincoln asked.
Lucky skirted around to the front of the sign, which was bolted to a metal post, and studied the words in large black capital letters against the orangy-yellow background:
SLOW CHILDREN AT PLAY
Lucky frowned. "So?" she asked.
"That sign is about us," Lincoln said. "Where's the pen?"...
Next to SLOW, he drew two neat perfect-size dots, one like a period and the other a little above it. Lucky knew it was a colon and it made the sign mean, "You must drive slow: There are children at play."
"Wow," she said. "That is... presidential."