Some more enlightened landlords at this time became more aware of the needs for proper sanitation and housing for their employees, and some estate villages were rebuilt to resemble what was thought to be an idyllic Elizabethan village, often grouped around a village green and pond; Mentmore in Buckinghamshire is an example of this, Pevsner noting the "Arts-and-Crafts (and) "cottage orné"" building styles. The Tudor Revival, though, now concentrated on the picturesque. This combined with a desire for "naturalness", an intention to make buildings appear as if they had developed organically over the centuries, which the architectural historian James Stevens Curl considered "one of the most significant of English contributions to architecture". An example is the "Tudor Village" constructed by Frank Loughborough Pearson for his client William Waldorf Astor at Hever Castle in Kent. Pearson went to considerable lengths to source genuine Elizabethan building materials for the cottages, including stone, tiles and bricks, leading Astor to comment; "I could not believe they had been built a few short months ago, they looked so old and crooked".