This one’s somewhat trickier than the last but if you know anything about Newton’s law of universal gravitation, you’re off to a good start.

This one’s somewhat trickier than the last but if you know anything about Newton’s law of universal gravitation, you’re off to a good start.

The photograph below shows my fireplace mantel, along with an assortment of random objects. Composited somewhere amongst the real-world objects is a synthetic object rendered with light more or less identical to that found in the original scene.
Can you spot the computer-generated image?
