There does not seem to be a researched history of sprung floors. Indeed, their use has gone out of fashion with the invent of proprietary systems. There would not have been much perceived need until recently, when concrete slabs started being generally used for sub-floors. Before then floors were mainly either earthen or used wood on joists, both of which provide some cushioning from shocks. Early sprung floors often used leaf or coil springs, whence the name; these floors tended to bounce, but modern floors have suppressed this 'trampoline' effect and so are often called "semi-sprung". Other materials have also been used, a notable example is the sprung floor in Danceland, Manitou Beach which was constructed in 1928 using coiled horsehair springs under a maple floor.