Kandinsky reinforces the relationship of the colour blue to distance in these quotations from The Spiritual in Art (1911).

• Blue … moves in upon itself, like a snail retreating into its shell, and draws away from the spectator.
• The inclination of blue to depth is so strong that its inner appeal is stronger when its shade is deeper.
• Blue is the typical heavenly colour.
• I perceive blue as a movement of detachment from man, from the human, a movement that draws us toward the centre of this colour but also towards the infinite, awakening in us a desire for the pure and, finally, for the supernatural.