Use this fun set of 30 cards to learn the difference between common cloud types and find out more about their formation and what they may mean for the day ahead. The author, Gavin Pretor-Pinney founded the Cloud Appreciation Society and is an established author on the cloud spotting. An inspirational gift for those who want to stay connected with nature and find some headspace in a busy world. Measures 4.25 x 1.34 x 5.04 in.