The donors of the work, husband and wife, are portrayed kneeling just in front of the pilasters that frame the chapel.  
"I was once what you are, and what I am you will become," is the translation of an inscription in Italian painted above a skeleton, said to represent Adam.  The donors of the work, husband and wife, are portrayed kneeling just in front of the pilasters that frame the chapel.  The dove of the Holy Spirit rests on Christ's halo.  The Virgin Mary and Saint John are represented on either side of the crucified Christ, whose arms are supported by God the Father.  FTP, identify this c. 1428 fresco in Santa Maria Novella in which Brunelleschi's single-point-perspective method is used brilliantly by Masaccio.
"I was once what you are, and what I am you will become," is the translation of an inscription in Italian painted above a skeleton, said to represent Adam.  
The Holy Trinity