 A picture of a three-tiered camera obscura (see illustration) has been attributed to Bacon, but the source for this attribution is not given.A very similar picture is found in Athanasius Kircher's "Ars Magna Lucis et Umbrae" (1646).Polish friar, theologian, physicist, mathematician and natural philosopher Erazmus Ciołek Witelo (also known as Vitello Thuringopolonis and by many different spellings of the name "Witelo") wrote about the camera obscura in his very influential treatise "Perspectiva" (circa 1270–1278), which was largely based on Ibn al-Haytham's work.