Joseph Wright of Derby in the context of Lunar Society of Birmingham

A hierarchy of genres is any formalization which ranks different genres in an art form in terms of their prestige and cultural value.

In literature, the epic was considered the highest form, for the reason expressed by Samuel Johnson in his Life of John Milton: "By the general consent of criticks, the first praise of genius is due to the writer of an epick poem, as it requires an assemblage of all the powers which are singly sufficient for other compositions." Below that came lyric poetry, and comic poetry, with a similar ranking for drama. The novel took a long time to establish a firm place in the hierarchy, doing so only as belief in any systematic hierarchy of forms expired in the 19th century.

The philosopher's stone is a mythic alchemical substance capable of turning base metals such as lead and mercury into gold or silver; it was also known as "the tincture" and "the powder" as well as "red lion" for gold and "white lion" for silver. Alchemists additionally believed that it could be used to make an elixir of life which made possible rejuvenation and immortality.

For many centuries, it was the most sought-after goal in alchemy. The philosopher's stone was the central symbol of the mystical terminology of alchemy, symbolizing perfection at its finest, divine illumination, and heavenly bliss. Efforts to discover the philosopher's stone were known as the Magnum Opus ("Great Work").

Tiberius Catius Asconius Silius Italicus (Latin: [ˈsiːlijʊs ɪˈt̪alɪkʊs], c. 26 – c. 101 AD) was a Roman senator, orator and epic poet of the Silver Age of Latin literature. His surviving work is the 17-book Punica, an epic poem about the Second Punic War and the longest surviving poem in Classical Latin at over 12,000 lines.

A Philosopher Lecturing on the Orrery, or the full title, A Philosopher giving that Lecture on the Orrery in which a lamp is put in place of the Sun, is a 1766 painting by Joseph Wright of Derby depicting a lecturer giving a demonstration of an orrery – a mechanical model of the Solar System – to a small audience. It is now in the Derby Museum and Art Gallery The painting preceded his similar An Experiment on a Bird in the Air Pump (National Gallery, London).

The first of Wright's candlelit masterpieces, Three Persons Viewing the Gladiator by Candlelight, was painted in 1765, and showed three men studying a small copy of the "Borghese Gladiator". The Gladiator was greatly admired; but his next painting, The Orrery, caused a greater stir, as it replaced the Classical subject at the centre of the scene with one of a scientific nature. Wright's depiction of the awe produced by scientific "miracles" marked a break with previous traditions in which the artistic depiction of such wonder was reserved for religious events, since to Wright the marvels of the technological age were as awe-inspiring as the subjects of the great religious paintings.

A pig bladder or pig's bladder is the urinary bladder of a domestic pig, similar to the human urinary bladder. Today, this hollow organ has various applications in medicine, and in traditional cuisines and customs. Historically, the pig bladder had several additional uses, all based on its properties as a lightweight, stretchable container that could be filled and tied off.

Hennig Brand (German pronunciation: [ˈhɛnɪç bʁant]; c. 1630 – c. 1692 or c. 1710) was a German alchemist who lived and worked in Hamburg. In 1669, Brand accidentally discovered the chemical element phosphorus while searching for the "philosopher's stone", a substance which was believed to transmute base metals into gold.

The Alchemist Discovering Phosphorus is a painting by Joseph Wright of Derby originally completed in 1771 then reworked in 1795. The full title of the painting is The Alchymist, in Search of the Philosopher's Stone, Discovers Phosphorus, and prays for the successful Conclusion of his operation, as was the custom of the Ancient Chymical Astrologers. It has been suggested that The Alchymist refers to the discovery of phosphorus by the Hamburg alchemist Hennig Brand in 1669. This story was often printed in popular chemical books in Wright's lifetime, and was widely known.

The Midlands Enlightenment, also known as the West Midlands Enlightenment or the Birmingham Enlightenment, was a scientific, economic, political, cultural and legal manifestation of the Age of Enlightenment that developed in Birmingham and the wider English Midlands during the second half of the eighteenth century.

At the core of the movement were the members of the Lunar Society of Birmingham, who included Erasmus Darwin, Matthew Boulton, James Watt, Joseph Priestley, Josiah Wedgwood, James Keir and Thomas Day. Other notable figures included the author Anna Seward, the painter Joseph Wright of Derby, the American colonist, botanist and poet Susanna Wright, the lexicographer Samuel Johnson, the typographer John Baskerville, the poet and landscape gardener William Shenstone and the architects James Wyatt and Samuel Wyatt.