The tables feature irregularly shaped glass tops, encased in a powder-coated steel frame with a raised lip around the edge. Slender metal rods form the legs.
Each table comes with an accompanying ladder that hooks over the side of the frame, and appears to be disappearing into the "water" of the pool. The ladders can be removed and repositioned, encouraging owners to "create their own story".
"The inspiration for the collection comes from dreamlike images of leisure and good times that swimming pools are able to evoke," said the studio. "We wanted to create a provocative object that could reach memories and arouse imagination."
"The tables propose a new environment for swimming pools, the interiors space, inviting users to allocate and occupy them as their own imagination," they added.
The pieces come in various heights and shapes, and are designed to be arranged together or independently.
"We believe some people will use them in a traditional way, locating it beside a sofa with a lamp on it or in a living room, decorating it with personal belongings," the studio told Dezeen.
"Some people will actually see it as a swimming pool and create a scene full of imagination, like children usually do," they added. "We believe that some people won't take advantage of its functional use, instead having it as a sculpture."
Rain was set up in 2014 by architect and product designer Ricard Innecco and Mariana Ramos, with the aim of "developing design in an artistic way".
Lanzavecchia + Wai designed equally whimsical furniture for its PLAYplay collection, which included stackable tables that looked like hamburgers.
Other unusually shaped furniture designs includes Jaime Háyon's monkey-themed tables and Milan designer Daniele Ragazzo's table supported by legs that resemble giant ball-headed sewing pins.