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The Austrian philosopher Ludwig Wittgenstein used a duck-rabbit image in his posthumous Philosophical Investigations () to illustrate what philosophers call aspect perception. The image can be seen in two ways – as either a duck or as a rabbit.

Specialties: Tools for Granite, Marble, Quartz, Tile, Stone Restoration and Concrete Polishing. 25th year in business servicing and selling to the natural and man-made stone industry. Lowest delivered price, 2-day USA Delivery. 12 in-house stone fabrication specialists, most with 15 to 21 years experience, standing by ready to help, EST.