Tonalism was an American artistic style that emerged in the late 19th century, characterized by soft, diffused light and a limited range of monochromatic or “tonal” colors. Unlike the bright, flickering light of French Impressionism, Tonalism focused on the mood and atmosphere of a landscape, often depicting it during “mystical” times of day—dawn, twilight, or under moonlight and mist.

For researchers and students, it is important to note that Tonalism was less about the physical details of a place and more about the emotional response it evoked. The paintings often have a “veiled” or “dreamlike” quality, achieved through multiple layers of thin glazes that make the surface appear to glow from within. It is considered a bridge between 19th-century Realism and 20th-century Abstraction.

Byzantine art refers to the body of Christian Greek artistic products of the Eastern Roman Empire. This style is the bridge between Classical Antiquity and the Middle Ages, shifting away from the 3D realism of the Greeks and Romans toward a highly symbolic, two-dimensional, and spiritual aesthetic.

For researchers and art centers, the defining characteristic is the “Eternal Presence.” Figures are depicted frontally with large, soul-searching eyes, existing in a timeless space represented by a flat gold background. This was not due to a lack of skill, but a deliberate theological choice: art was meant to be a “window to heaven” (Icon), not a reflection of the physical world. The architecture is equally revolutionary, perfecting the Pendentive—a constructive device permitting the placing of a circular dome over a square room.

Expressionism is a modernist movement that originated in Northern Europe at the beginning of the 20th century. Its core principle is the prioritization of emotional experience over physical reality. Unlike Impressionism, which sought to capture the visual “impression” of light, Expressionism seeks to depict the “expression” of the artist’s inner world—often involving intense feelings of anxiety, fear, passion, or spiritual awakening.

For students and art centers, the style is defined by a radical distortion of form and the use of violent, non-naturalistic colors. It is not meant to be “beautiful” in the traditional sense; rather, it aims to be “honest” and “visceral.” The movement is typically divided into two influential German groups:

• Die Brücke (The Bridge): Known for crude, jagged lines and a primitive, raw aesthetic.

• Der Blaue Reiter (The Blue Rider): More abstract and focused on the spiritual and symbolic power of color.

Impressionism is perhaps the most famous movement in modern art history, marking the moment when painting shifted from “what the eye knows” to “what the eye sees.” It originated as a rebellion against the rigid, polished standards of the French Académie des Beaux-Arts.

Rather than focusing on precise detail and smooth finishes, Impressionist painters sought to capture the ephemeral moment—the shifting effects of light, weather, and time on a subject. This was facilitated by the invention of portable tin paint tubes, which allowed artists to leave their studios and paint en plein air (outdoors). The style is defined by short, thick strokes of paint that capture the essence of a subject rather than its details. When viewed up close, an Impressionist painting looks like a chaotic mess of colors; however, when the viewer steps back, the eye performs optical mixing, blending the distinct strokes into a vibrant, shimmering image.