| 摘要 |
<p>A mosaic piece having a body contour inscribed within a circle, and being formed with at least one projection having a projection contour. The body contour and the projection contour coincide at points P1 and P2. The inner circle further contains a point P3 located outside the projection contour so that the angular distance of P3 from P1 is equal to the angular distance of P2 from P1 with respect to the center of the inner circle. The projection contour further contains a point Pa so that the entire projection contour is located on one side of a reference border line B.L. extended between point P3 and a point Pa. The mosaic piece being formed with a locking recess having a locking recess contour defined between points P3-P1-Pa. The projection contour further comprising a point P' between points Pa and P1. The projection is formed with an engagement portion having an engagement contour defined between points P'-Pa-P2 and a line L extending between points P' and P2. The engagement portion is of corresponding shape and size to be fully contained within the locking recess.</p> |
