Pesach has matza, the Seder; Succot has the Four Species and the succah; Shavuot, however, has no single identifying mitzva, Why?
Rabbi Sinclair's book on the weekly Parsha - https://www.israelbookshoppublications.com/store/pc/The-Color-of-Heaven-54p652.htm
Rabbi Sinclair's on-line art gallery - http://www.seasonsofthemoon.com/
