On the strength of a Calmgrove review, I ordered a copy of The Imagination Chamber: Cosmic Rays from Lyra's Universe by Philip Pullman. For inventors of imaginary worlds, the idea of a cloud chamber is an apt metaphor. You never know when a character, setting, or action will pop up—nothing full blown, just glimpses, like a particle trail. Collecting these haphazardly in notebooks is essential. Rereading the notebooks sparks new connections. I'm enjoying Pullman's stray phrases and visualizations of Lyra's world one a day. Even better is the reaffirmation that jotting down my own ideas matters (pun not intended by retained).