The condition of the fresco is not optimal in this section and the dove is often mistaken for a collar of some sort, but a close look at the beak leaves no room for doubt. For decades sculptures had art pieces that depicted so much naturalism and depth, but Masaccio was one of the first artists to create the sense of naturalism and depth in a painting.
Restoration was done to the Crucifixion section of the painting at that time, to replace missing areas of the design; mostly architectural details around the perimeter of the work.
The emphasis is more on equilibrium, symmetry and the rational. Inside, framed by Ionic columns, Corinthian pilasters and a barrel-vault ceiling, a crucified Christ is overlooked by God and the Holy Spirit, flanked by John the Evangelist and the Virgin Mary.
In the end, we will end up like the skeleton as well. The invention of single point perspective is a critical point in history that is seen as a part of a whole development; also as one of a number of pictorial devices that artists may or may not in depicting their subjects.
Essay about The Holy Trinity: Masaccio - Innovators can be found in all fields of work, whether it is Albert Einstein in physics, Isaac Newton in mathematics, or Masaccio in early Renaissance painting.
Masaccio paid extremely close attention to the dimensions of the objects and spaces that he painted, so much so that you can actually determine the dimensions of the room we are looking at in the fresco. But the fresco is not merely a reminder of where we will finish our days but also an indication of the path to redemption via the central mystery of the Christian Church, the Eucharist.