Each Christmas, the mail carrier leaves a package on Leo's front porch from a town somewhere in the Midwest. His elder brother, Felix, a loner and dreamer, has slipped behind a secret door to enter a timeless realm of images and ideas. On Felix's trip through the cosmos, his deceased dad explains a shower of shining scientific and religious phenomena popping out all around them.To enter the realm of wonder through the door of imagination is rare. Odds of returning are slim to none. Felix brings back a gift for Leo. In a society where eyes are attached to smartphones, ears are plugged with earbuds, and wrists are shackled with watches that play music, inspire exercise, and measure heart rates, does Felix give Leo the latest AI contraption?