This box is an example of paradox since it shows an inconsistency. The box has a column that appears to be in the front, as well as in the back. The real construction of a cube such as this one is virtually impossible. It forms an optical illusion to the brain where you can see two possibilities of a result but they are just fake illusions.
In this image, a clear example of paradox is presented. The image shows the tennis court inverted upside down, while the players are still normal. It hurts my brain just to look at it, since it makes the illusion that everything is normal, but really the court is inverted while the players arent, but it still looks normal. It is a virtually impossible thing to do and therefore is an example or paradox.
The image above shows an example of oxymoron. Oxymoron is to have two contradictory things together, and a stop sign next to one that says keep moving is a good example. They each contradict the other sign by ordering the opposite direction to traffic. Since they are opposites placed together, they are an example of oxymoron.
