Trees and lakes.

“I'm living at a peak of clarity and beauty I never knew existed. Every part of me is attuned to the work. I soak it up into my pores during the day, and at night—in the moments before I pass off into sleep—ideas explode into my head like fireworks. There is no greater joy than the burst of solution to a problem. Incredible that anything could happen to take away this bubbling energy, the zest that fills everything I do. It's as if all the knowledge I've soaked in during the past months has coalesced and lifted me to a peak of light and understanding. This is beauty, love, and truth all rolled into one. This is joy.”
― Daniel Keyes