Art Glass Vessel Base (Unidentified Maker)

This item is the base or bottom portion of an art glass vessel, likely a bowl, vase, or another decorative container. The primary color visible is a rich, translucent dark reddish-brown or amber tone that appears to shift depending on the light, possibly exhibiting iridescence or opalescence, though this is not definitively clear from the image. The interior surface of the base shows swirling patterns of color, primarily a lighter, more muted reddish-brown and areas of a dark, almost charcoal gray or deep blue. These color variations suggest an intentional design, possibly achieved through glass blowing techniques 'incalmo' or 'murrine' or by layering different colored glass. The texture of the interior surface appears somewhat uneven or organic, typical of hand-blown glass, with subtle indentations and flows visible. There is what appears to be a pontil scar (점 찍기 흉터) or a rough, unpolished area at the center of the base, which is a common characteristic indicating hand-blown glass. No distinct maker's marks, signatures, or stamps are discernible from the provided image. The overall style suggests a modern or mid-20th century to contemporary art glass aesthetic, emphasizing form and color interaction rather than elaborate external decoration. Some minor surface wear or dust is visible, particularly within the textured areas of the base, but no significant cracks, chips, or repairs can be identified solely from this view. The quality of craftsmanship appears to be good, with a smooth, finished rim on the exterior bottom edge, though the actual opening/rim of the vessel itself is not shown. The piece has a substantial, weighty feel suggested by the thick glass visible at the base.