This demonstrates stereoscopic character with figures in space. The subordination of perspective relation to meaning can be clearly seen in the picture: the royals occupying the central space are perceived as larger than the figures at the front. The chessboard is turned toward us (for easier comprehension) by the artist. Actually all the pictorial images are converted to the basic plane of the inner space of the letter. The stereoscopic image is originated partly by the disclosure of shapes and forms, partly by the basic plane’s moving into the foreground as its tonality changes and partly by the "keyhole effect" in the visual field. (Miniature from the 15th century)

The early use of geometrical perspective show that the artists were not perfectly aware of its regularities. The vanishing points do not always meet, and we can see that the artists in some cases, e.g. depiction of the floor, use the safer means of symmetry. We can see that the harsh planes of the drapery appear to be closer than the gently depicted angels, hereby creating the relation between Maria and the angels in the picture plane. (Bernardo Daddi: The Annunciation, c.1340)