Fresh from the depths of Reddit, user icreatenovelty posted this rather wonderful picture where they’ve used Super-Hydrophobic coating and stencils to create art that only shows when it’s raining.
How cool is that! I knew you’d like it.
So how does it work?
Superhydrophobic surfaces are highly hydrophobic, i.e., extremely difficult to wet. The contact angles of a water droplet exceeds 150° and the roll-off angle/contact angle hysteresis is less than 10°. This is also referred to as the Lotus effect, after the superhydrophobic leaves of the lotus plant.