The plane mobile was an electrical device with four miniature airplanes hanging from it that revolved around a yellow star. It hung over the crib in the Nursery in the Staff, which was intended for Aaron once Claire gave birth. ("Maternity Leave") The mobile was similar to the one that was seen in Claire's dream. ("Raised by Another") Also in Claire's dream, a noise similar to that of the discharge and electromagnetic creaking was heard, just before the planes started to spin. Both of these happenings may be instances of premonition, a theme prevalent in Lost.