In the 1890s, a guy named George Stratton decided to build a pair of glasses that made the world upside down. He wanted to explore the effect of presenting the retina of our eye with an upright image, since the image that it sees is inverted.
The conclusion of his experiments demonstrated that, after some hours of adaptation (and probably making everyone in the room collapse in laughter seeing him trying to drink a cup of tea), most things he saw looked normal using those glasses and, upon closer inspection, looked weird again. Since then, tens of scientific experiments have based on his conclusions to find out about other interesting and wacky situations our brains can adapt and readapt to.
Today, I opened IntelliJ
again, after about 3 months of heavy Eclipse
usage. Trying to use the keyboard shortcuts felt like taking those glasses off.