[6] Making the friendship of Thomas Gainsborough he became interested in landscape, and with the encouragement of the antiquary Sir Joseph Ayloffe (who was developing materials for an extensive History of Suffolk) he prepared illustrations of ancient buildings and monuments in the county.[10] In 1751 he issued proposals[11] for a quarto volume on Brook Taylor's Perspective, made easy, both in Theory and Practice, to have a frontispiece by William Hogarth.[15] In 1755, Kirby moved to London,[16] and was subsequently introduced by the Earl of Bute to the Prince of Wales (the future King George III), whom he instructed in linear perspective.Fresh editions of the Method of Perspective made Easy were produced in 1765 and 1768, and this remained a popular standard work until superseded by that of Thomas Malton, published in 1771.[24] Kirby, a devout and somewhat modest man, had great pride in his son William, who was sent to Italy to study for three years 1768–71 at the King's personal expense, and returned full of promise.
The
Ipswich
Blackfriars domestic range, from Kirby's
Twelve Prints
, 1748
Satire on false perspective, showing all of the common mistakes artists make in perspective, by Hogarth, 1753