Boxes

    I have a table containing coordinates and I want to insert these into
another table, converting them to boxes.

    I would like to use the same syntax as arrays :

    INSERT INTO ... (coords) SELECT ARRAY[a,b,c] FROM ...

    But I want boxes. Is there a way to do this ?

    SELECT BOX[[a,b],[c,d]] FROM ...
    raises a Syntax Error.
    And I'd like to avoid to concatenate strings to build a box
representation like
    '((1,2),(3,4))'::box;

    Is there a way ?

    Thanks !