Robert Gildea’s “water lounge,” patented in 1975, brings a pool to your patio:

Swimming pools are not only cumbersome and expensive but require open space where they are located. The ever increasing problem of accidents around such devices is also of concern. While the public has long sought a more convenient and less expensive device for cooling the body in the summer time, no such devices have been introduced. A device much smaller than the traditional swimming pool having the same general beneficial characteristics without the detrimental ones has long been sought.

The answer is to turn the lounge into a basin that can be filled from a hose. An umbrella “prevents the water from rapidly rising in temperature, which makes the water lounge more refreshing.”