Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Open (Adjective)

Open as a smile.
—Elizabeth Barrett Browning

Open as shore to the sea.
—Rose T. Cooke

Open as the mid-day.
—R. Davenport

Open as the inn gates to receive guests.
—George Gascoigne

Wide open like the church portals when the bride and bridgeroom enter.
—Oliver Wendell Holmes

Open as a plate.
—George Meredith

Minds open as a well-read book.
—Charles Sangster

Open as day, for melting charity.
—William Shakespeare