Fantastical or impossible events (a mountain falling in love, elves living in a house) are treated by the characters as ordinary and are met with calm reactions rather than astonishment. Withholding the characters' surprise is what produces the humor and tenderness, not the strangeness itself.
Each daily strip is engineered to open, turn, and resolve within a few panels, functioning as a self-contained poem rather than a chapter of an ongoing plot. The payoff can be a joke, a quiet image, or an unresolved mood, so resolution does not require a punchline.
Gentle, playful imagery is used as a vehicle for loneliness, longing, and mortality rather than only lightness, so a comic drawn cutely can still sit with sadness. The softness of the style is what allows heavier feelings to be approached without despair.