So, it's technically a kind of mental exercise! The brainteaser above shows a circle with a dot in the middle. You need to copy the layout and then place the pencil on the dot. Now, you need to ...

MEMPHIS, Tenn. — A video of eight dots rolling along a circle is more than first meets the eye. YouTube user brusspup, who creates videos of optical illusions, uploaded the video Monday.

Given their DIY-like nature, the thought of getting a stick-and-poke tattoo might sound a little ... needle into ink and poking the skin with it, dot by dot. The results often tend to look more ...