How to draw a 3D cube illusion on graph paper

There are hundreds of places around the world where round objects seem to roll uphill. They are often referred to as "anti-gravity hills" (or sometimes "gravity hills," "magnetic hills," and… READ THE REST

This one's animated, so go and check out the interactive Pigeon Neck illusion at Michael Bach's website. In the animation above you see "pigeons" craning their neck while scurrying along,… READ THE REST

Which of these "buses" is moving faster? While they appear to be in a "race," they are actually moving at the same speed, as revealed when the background becomes solid… READ THE REST

We thank our sponsor for making this content possible; it is not written by the editorial staff nor does it necessarily reflect its views. TL;DR: Tell Dad you love him with… READ THE REST

We thank our sponsor for making this content possible; it is not written by the editorial staff nor does it necessarily reflect its views. TL;DR: Slip this lightweight refurbished Apple iPad Mini… READ THE REST

We thank our sponsor for making this content possible; it is not written by the editorial staff nor does it necessarily reflect its views. TL;DR: Treat Dad to the SwingLogic SLX MicroSim… READ THE REST