HarperCollins’s Think Big tour, which took place last month, brought together three author-illustrators—Michael Hall, Marcie Colleen, and Tom Sullivan—for school visits in six cities across the country. Hall’s Little i follows a lowercase “i” in search of its missing dot. Colleen’s Love, Triangle tells the story of a two-sided friendship turned complicated by the entrance of a triangle. And Sullivan’s Blue vs. Yellow chronicles the battle between two primary hues. The tour focused on the themes in each of the authors’ latest books and encouraged students to think about core building blocks of storytelling: letters, shapes, and colors.

The school visits kicked off on October 10 in San Carlos, Calif., and capped off in Boston on October 18. We’ve rounded up some highlights from the multi-author events, which featured interactive storytimes, signings, and more.

(From l.) Authors Hall, Colleen, and Sullivan launch their tour at Heather Elementary School in San Carlos with an event hosted by the Reading Bug.

Hall discusses Little i and answers questions at West Valley Elementary in San Jose. Photo: Hicklebee’s

Sullivan talks about Blue vs. Yellow during a multimedia presentation at South Hillsborough School in Hillsborough, Calif.

Colleen presents Love, Triangle to Arleta Elementary School students in Portland, Ore., during a visit arranged by Green Bean Bookshop.

Hall chats one-on-one with a student at Lent Elementary School in Portland.

Sullivan hosts a storytime at Green Bean Books in Portland.

The authors join Ashley Elementary librarian Kristen Whittaker in Dallas during an event organized by Barnes & Noble Frisco.

Colleen and Sullivan sign a story they collaborated on with Randolph Elementary students, in Universal City, Tex., during a visit arranged by Blue Willow Bookshop.

Sullivan meets Saphira the bearded dragon at Randolph Elementary.

Sullivan signs the wall of fame at Houston’s Blue Willow Bookshop.

The authors get ready to deliver a final presentation at the Cambridge Public Library in Cambridge, Mass.