Eureka Dr. Seuss The Cat in the Hat 'One Thing After Another' Classroom Poster, 17'' W x 22'' H Includes (1) reusable school poster. Poster measures 17'' W x 22'' H Welcome your students back to school with this vibrant Dr.Seuss poster filled with beloved characters from Cat in The Hat. Caption on poster with Thing 1 and Thing 2 reads '' it's just one Thing, after another!'' Printed on cardstock this colorful Dr.Seuss poster is sure to last the test of time.