Incredible skywriting in Phoenix that looks just like typed words

Incredible text that appeared above Phoenix has left onlookers confused as to how it was created. The messages, including'cisco #collabsummit', are a form of skywriting which has the appearance of digitally typed text. Skytyping, or digital skywriting, is a technique whereby smoke is emitted in a series of bursts, each of which can be the length of a skyscraper. These appear like the text produced by old fashioned dot matrix printers, in which characters are formed on the page by printing rows and columns of ink dots. Skytyping, or digital skywriting, is a technique whereby smoke is emitted in a series of bursts, each of which can be the length of a skyscraper.