Water Shadow Curtain Turns Any Room into an Underwater Oasis

The global pandemic has forced many of us to spend more time in our rooms than we ever expected. And for those living in dense cities, that also means we’ve been using our curtains more. So Tokyo-based designer Oto Kawamata came up with an idea that would allow us to make that indoor time subtly more enjoyable, even with closed curtains.

Water Shadow Curtain is a lace-based curtain that filters light to create caustics, the randomly fluctuating patterns of bright lines at the bottom of the pool or aquarium. These caustics are caused by reflection and refraction of sunlight that create illuminated lines which flow gently as the sun moves or the curtains flow.

Mimicking this underwater sensation by using curtains has the potential to bring joy and magic into a room, explains the designer in his product brief below, adding that he hopes the idea can help create a more relaxing environment and alleviate stress as we spend more time indoors.

The product is still in prototype phase but the designer received so much positive feedback on Twitter that he’s formed a design agency and is working to accelerate bringing Water Shadow Curtain to market. You can stay up-to-date by following them on Instagram.


  1. the pictures are clearly just conceptual mockups. is there any evidence he can actually make this? you can’t refract light with lace.

  2. so nice and wonderful. will add to my day.

  3. This is really cool!!!

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