Definition

Diptych: A painting, especially an altarpiece, on two hinged wooden panels that may be closed like a book. Or, an ancient writing tablet consisting of two hinged leaves with waxed inner-sides.

Folded in two, or a pair of writing tablets.

Photography Diptych

Putting two photos together; to create a new meaning:

eric kim diptcyh - street portraits

small-tree and hand