Author's Note: Description of Illusion:
Each of the 2 rows of goblets contains an illusion. The bases of the goblets are not in the same position as the liquid-filled tops. Bases that are in the rear row have goblets at the front, and vice versa. The top and bottom rows' goblets/bases are in different positions, and are not supposed to be reflections or mirror images.
Between the sets of goblets, I added a plane, which I turned into a thick pane of glass. Depending on how you look at the glass, each of the two corners (top left and bottom right) can be the one closest to you. The two vertical lines, each representing a corner, can be seen as either an interior corner or exterior corner. Depending on which way you view the glass plane, the goblets on the top and bottom will appear to be either on top of the glass, below it or extending through the glass.
Finally, if you turn the picture (or your head) over, it looks completely different, angle-wise.
This is the most difficult project I've ever created and I hope you enjoy it.
Source: Photo of a single goblet is from Morguefile. This one really should be viewed at largest full to really see the illusions.
Comments, criticisms or suggestions are welcome.