

Solid Air is the fourth studio album by English musician John Martyn. It was recorded at Sound Techniques Studio in London in 1972 and released by Island Records in 1973.
The picture was taken by John Webster using the schlieren photography process (see a video explanation), usually used by physicists to study airflow. (I’d suspect the picture was taken using a tricolor filter, with four candles behind a hand, and was rotated by 90 degrees afterwards)
The sleeve design is credited to designer Fabio Nicoli (sometimes credited as Fabio Nicoli Associates for other album covers).
Goudy Oldstyle is used with tight letterspacing for the artist’s name and album title. They are displayed on the same line, using the same font and color, the name being in uppercase and the title in lowercase.