What the royal circles of the Enlightenment undoubtedly valued was sensual pleasure understood as the empirical experience of that which is beautiful, tasteful, and sophisticated. However, one cannot understate the importance of striving towards the Horatian virtue of inner balance and sentimental emotionality, which introduced to the world of culture the perception of man as an integral element of nature.
The Palace on the Isle boasted a Bathroom, whose walls were decorated with little stones, shell motifs, and Dutch tiles. According to Grzegorz Piątek, what one could originally find here were
two tin bathtubs, sunk into the stone floor, filled with warm water from a boiler hidden behind the wall.
When they happened not to be in use, they were covered with wooden planks, with mattresses and cushions piled up on top. In his Big Book of Łazienki, Marek Kwiatkowski states directly that in the Enlightenment, baths that were not being used at a given moment would serve as settees.
As interiors were being designed to fit the classicist aesthetics, the project of the Łazienki Park was under development, too. The first stage of gardening work was finished around the year 1780. While the preserve, previously meant for hunting, was turned into a French-style geometrical garden, commonly accessible, wild park areas were still maintained for public use (in the form of English gardens). This way a key moment in the history of the Łazienki Park design, as it was only then that the north-south axis of the park, so clearly visible now, was delineated. The directions are indicated by two ponds, the North Pond and the South Pond, on both sides of the Palace on the Isle. Both have been laid out parallelly to Aleje Jerozolimskie, with the latter also having been located on a south-north axis. The layout, maintained up until today, has become crucial for the harmonious composition of Łazienki.
On the terrace of the Palace on the Isle, one can find two aquatic sculptures: ‘The Allegory of the Bug’ and ‘The Allegory of the Vistula,’ the first versions of which were commissioned by Stanisław August. The park, in turn, boasts ‘The Water Allegory.’ This last sculpture is easy to recognise since it depicts a woman holding a jug directed downwards, pouring water out of it (which is, of course, only possible to see if our imagination manages to animate the stony mass of the stream). However, the most important water-related construction in Łazienki is the Water Tower, also known as the Reservoir. As the name suggests, this is where the water flowing down the scarp would be collected and then channelled through a wooden pipeline to the palace bath and to the fountain on the terrace. The building, currently open to visitors, has the form of a rotunda, and, despite its modest size, has managed to fit an exhibition devoted to the function and significance of water for Łazienki.