Shades of Grace: The Virgin of the Rocks and Leonardo da Vinci’s Notes on Paragone

Ricardo De Mambro Santos

doi:10.3390/rel12110994

Shades of Grace: The Virgin of the Rocks and Leonardo da Vinci’s Notes on Paragone

Religions ◽

10.3390/rel12110994 ◽

2021 ◽

Vol 12 (11) ◽

pp. 994

Author(s):

Ricardo De Mambro Santos

Keyword(s):

The Arts ◽

Religious Theme

This essay analyses Leonardo da Vinci’s innovative iconography in the making of the panel known as the Virgin of the Rocks (Paris, Louvre) in relation to his considerations on the important Renaissance debate of Paragone, or comparison among the arts, namely, Painting, Sculpture, Music, and Poetry. It will be argued that this work, as a depiction of a complex religious theme, may be interpreted as a laboratory for Paragone-related demonstrations, especially in regards to five points: the optical tangibility of the image; the temporalities involved in the representation; the variety of subjects; and, finally, its iconic stability and semiotic openness as vehicles to further stimulate the devotional value of the painting.

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Electron Microscopy in Molecular Biology

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100060027 ◽

1967 ◽

Vol 25 ◽

pp. 2-3

Author(s):

Cecil E. Hall

Keyword(s):

Electron Microscopy ◽

Molecular Biology ◽

Noise Level ◽

Molecular Structures ◽

Material Structure ◽

The Arts ◽

Shadow Casting ◽

Electron Image ◽

High Degree ◽

Very High

The visualization of organic macromolecules such as proteins, nucleic acids, viruses and virus components has reached its high degree of effectiveness owing to refinements and reliability of instruments and to the invention of methods for enhancing the structure of these materials within the electron image. The latter techniques have been most important because what can be seen depends upon the molecular and atomic character of the object as modified which is rarely evident in the pristine material. Structure may thus be displayed by the arts of positive and negative staining, shadow casting, replication and other techniques. Enhancement of contrast, which delineates bounds of isolated macromolecules has been effected progressively over the years as illustrated in Figs. 1, 2, 3 and 4 by these methods. We now look to the future wondering what other visions are waiting to be seen. The instrument designers will need to exact from the arts of fabrication the performance that theory has prescribed as well as methods for phase and interference contrast with explorations of the potentialities of very high and very low voltages. Chemistry must play an increasingly important part in future progress by providing specific stain molecules of high visibility, substrates of vanishing “noise” level and means for preservation of molecular structures that usually exist in a solvated condition.

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