Green Is the Colour song was a regular part of the band's shows from early 1969 through 1970, then less common in 1971. It was played for the last time during their short tour of Japan and Australia in August 1971. The song was later played by Nick Mason's Saucerful of Secrets. with: Green Is the Colour "Green Is the Colour" is a track on Pink Floyd's 1969 "More". It was composed and written by Roger Waters and sung by David Gilmour. A tin whistle is heard in the song, played by drummer Nick Mason's then-wife Lindy. A live version of the song was
Eye measurement of visual acuity of the eye. For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD (1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m). A rat can resolve only about 1 to 2 CPD. A horse has higher acuity through most of the visual field of its eyes than a human has, but does not match the high acuity of the human eye's central fovea region. Spherical aberration limits the resolution of a 7 mm pupil to about 3 arcminutes per line pair. At a pupil diameter of 3