Kinetic sandscape art object in the manner of Klaus Bosch

This decorative art object is a moving sand picture, generally consisting of a sealed circular glass disc filled with liquid, air bubbles, and various layers of colored and metallic sands that shift to create geological or abstract landscapes when rotated. The object is framed in a dark, possibly black or dark wood-toned circular bezel and is supported by a matching rectangular black base stand. Within the visible display area, layered dark and light sands form abstract, mountainous or cloud-like formations. The overall physical structure appears to be in fair to good visual condition, though detailed signs of micro-wear or internal air changes cannot be confirmed from this angle. In the bottom right corner of the base, there are subtle markings that appear to read 'KB', which the owner's unverified notes suggest could stand for artist Klaus Bosch. Because signatures, initials, and markings in photographs can be replicated or misinterpreted without physical inspection, this specific attribution remains a hypothesis and is unverified. The item displays craftsmanship consistent with late 20th- or early 21st-century decorative desk toys and kinetic sand art pieces. Hedged language is used for the maker attribution due to the lack of physical authentication and the possibility that the initials could belong to another maker or studio assistant. The owner-supplied attribution of Klaus Bosch is noted strictly as unverified context.

Based on what I can see in the provided image, this decorative kinetic sandscape art object features a circular glass disc filled with liquid, air, and layered colored sands set within a dark circular bezel and rectangular base stand. Per user submission: attributed to Klaus Bosch, the object bears subtle markings on the base that appear to read 'KB'. I cannot verify from a photo whether this mark is a genuine maker's mark, nor can I confirm the internal mechanics, fluid stability, or absence of micro-wear without physical inspection. The estimate range of $100 to $250 assumes the attribution to Klaus Bosch is correct, aligning with typical secondary market values for similar mid-to-late period kinetic sand art pieces. General market demand for interactive desk art of this type remains steady among collectors of novelty and kinetic decor, though prices fluctuate based on size, visual complexity, and condition. To confirm authenticity and authorship, an in-person examination by a qualified expert specializing in kinetic art, along with provenance documentation or direct comparison of the signature mark, would be required. If the item turns out to be a reproduction, replica, copy, or produced 'in the style of' rather than by the attributed maker, the value would likely decrease significantly, dropping closer to $30-$60, as unbranded or decorative mass-market sand art commands a much lower collector interest.