Why Can't Some People See Magic Eye Pictures?

When we discussed how Magic Eye pictures work, a lot of people commented about how they can never see the hidden image. So what gives? Is there something wrong with these people's eyes? Are they cursed? Are there really no hidden pictures? Is this all a hoax?

Most Magic Eye problems have to do with the way the eyes work with each other and the brain. To view 3D stereo images, your peepers have to work together as a coordinated team. If they're not pulling together, you're going to have some glitches in your binocular (two-eyed) vision or stereo vision (where the two slightly different views from your eyes are combined in the brain). A number of things can cause binocular and stereo vision impairment — most commonly, deviations or misalignments of one or both eyes ("crossed eyes" or "wall eyes"), situations where one eye is dominant because visual stimulation either transmits poorly or not at all from the other, astigmatism or cataracts. If you think you have an eye problem, go see an eye doctor who can test and treat your stereo vision.

If your eyes are fine, then your Magic Eye problems could just be a matter of technique. The makers of Magic Eye offer this advice:

Hold the center of the printed image right up to your nose. It should be blurry. Focus as though you are looking through the image into the distance. Very slowly move the image away from your face until the two squares above the image turn into three squares. If you see four squares, move the image farther away from your face until you see three squares. If you see one or two squares, start over!

When you clearly see three squares, hold the page still, and the hidden image will magically appear. Once you perceive the hidden image and depth, you can look around the entire 3D image. The longer you look, the clearer the illusion becomes. The farther away you hold the page, the deeper it becomes. Good Luck!

[Special thanks to my friend Molly, who can't see 3D movies and encouraged me to steal her story idea for a Big Question.]

Why Do We Wear Costumes on Halloween?

nito100/iStock via Getty Images
nito100/iStock via Getty Images

There’s no one explanation for how Halloween costumes originated. Much like the holiday itself, the practice of dressing up is the result of a hodgepodge of traditions from around the world.

Many historians suspect that the tradition has some basis in the Celtic festival of Samhain (also called Calan Gaeaf in Wales). Celebrated between the autumn equinox and the winter solstice, Samhain marks the official start of winter—known to the Celts as the “dark season.” During Samhain, “the world of the gods was believed to be made visible to humankind,” according to the Encyclopedia Britannica.

That wasn’t a comfort to the ancient Celts, who believed their deities were prone to playing tricks on human worshippers. Many festival participants disguised themselves as animals or beasts, hoping to hide from malevolent spirits who might bring them misfortune.

Move forward a few centuries and the modern-day practice of dressing up and trick-or-treating has its roots in the European custom of “mumming and guising.” Mummers would dress up in costumes, often woven from straw, and perform plays and songs for neighbors in exchange for food. Scottish and Irish immigrants brought that tradition to North America, where it later morphed into what we now know as trick-or-treating.

Halloween costumes didn’t experience their true heyday until the mid-1900s, though. For that, you can thank New York City entrepreneurs Ben and Nat Cooper, who started a company producing pop culture-themed costumes at a low cost. Ben Cooper, Inc., found a niche in helping kids become the characters they admired from television and comic books, often purchasing merchandising rights before said characters ever became popular. Due in no small part to the Cooper family’s innovation, Halloween costumes became an accessible and even necessary part of holiday festivities.

Today, Halloween costumes are big business. The National Retail Federation estimates that Americans will spend about $3.2 billion on costumes this year (of that, about half a billion will go to costuming pets). You have to wonder what the ancient Celts would have thought about today’s Halloween costumes.

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What's the Difference Between a College and a University?

Chinnapong/iStock via Getty Images
Chinnapong/iStock via Getty Images

Going off to college is a milestone in any young adult’s life. The phrase itself conjures up images of newfound independence, exposure to new perspectives, knowledge, and possibly even one or more sips of alcohol.

In America, however, few people use the phrase “going off to university,” or “headed to university,” even if they are indeed about to set off for, say, Harvard University. Why did college become the predominant term for postsecondary education? And is there any difference between the two institutions?

While university appears to be the older of the two terms, dating as far back as the 13th century, schools and students in North America have embraced college to describe most places of higher learning. There is no rigid definition of the words, but there are some general attributes for each. A college is typically a four-year school that offers undergraduate degrees like an associate or a bachelor’s. (Community colleges are often two-year schools.) They don’t typically offer master’s or doctorates, and the size of their student body is typically the smaller of the two.

Universities, on the other hand, tend to offer both undergraduate and graduate programs leading to advanced degrees for a larger group of students. They can also be comprised of several schools—referred to as colleges—under their umbrella. A university could offer both a school of arts and sciences and a school of business. The University of Michigan has a College of Engineering, for example.

While many of these traits are common, they’re not guaranteed. Some colleges can be bigger than universities, some might offer master’s degrees, and so on. To complicate matters further, an institution that fits the criteria of a university might choose to call itself a college. Both Dartmouth College and Boston College qualify as universities but use the college label owing to tradition. Schools may begin as colleges, grow into universities, but retain the original name.

People tend to think of a university as being more prestigious or harder to get into, but there are too many variables to make that determination at a glance. Some colleges might ask more of applicants than universities. Some universities might be smaller than certain colleges. Either one can be public or private.

Things get a little more convoluted abroad. In the UK, students go off to university (or uni) instead of college. The British version of college is typically a two-year program where students either focus on learning one particular skill set (much like a vocational school) or use the time to prepare for exams so that they can advance to university. Language matters, too; in Spanish, colegio usually refers to high school.

While the terms aren’t strictly interchangeable, there is enough of a difference between the two to try and make the distinction. Keep in mind that some states, like New Jersey, have rules about how institutions label themselves. There, a university has to have at least three fields of graduate study leading to advanced degrees.

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