From this sight angle, the conical shape creates the impression of glass that is almost entirely black. The contact surface (top and bottom) tapering towards the back is clearly discernible here, causing the viewing side (front) to meet the sight angle of the viewer.
Here one can see the black 2mm glass backing (left) reflected in the glass at the front. The glass body itself is transparent. One can also readily see the conical shape.
The front (viewing side) is tilted slightly back as a result, making the lasered motif easier to view.
Perspective from above
The black glass backing reflected in the front and presenting the lasered motive to best advantage is readily discernible from this sight angle. One can also see the lateral contours well, with their conical shape starting at about 15mm and guiding the incidence of light.