If you are looking at a computer screen, your right hand is probably resting on a mouse. To the left of that mouse (or above, if you’re on a laptop) is your keyboard. As you work on the computer, your right hand moves back and forth from keyboard to mouse. You can’t do everything you need to do on a computer without constantly moving between input devices.

There is another way.

A device called a “keyset” could help us navigate virtual environments without moving your hands back and forth. With the mouse in your right hand, the keyset would occupy your left hand. Its five buttons resembled piano keys.

Used in tandem with a mouse (specifically, a three-button mouse), the keyset enabled the user to type out all the characters of the alphabet, and execute shortcut commands. The keyboard, thus, would be secondary — perhaps even irrelevant — meaning users could keep their eyes the screen, and not glance down at their fingers.

This could be the way of the future. But it’s actually the way of the past.

Doug Engelbart invented the keyset in the 1960s. Engelbart was also the person who invented the mouse.

Engelbart’s first mouse was a block of wood about the size of three decks of cards stacked on top of each other. It pivoted atop a metal wheel, and had three buttons.

Not satisfied merely pointing and clicking, Engelbart imagined that his mouse would be used in combination with a keyset to execute all kinds of commands that today are difficult to imagine doing without a keyboard.

Take word processing, for instance. The five-button keyset could produce all 26 letters by memorizing combinations of these keys used together. Learning to type would take a lot of practice, but Engelbart believed that with lots of repetition, the muscle memory would take over.

Even Doug Engelbart realized that learning the keyset was difficult. But for Engelbart, ease of use wasn’t the top priority. He wanted the computer inputs to be as powerful possible, and that required some complexity. He imagined that consumers would learn how to use the mouse and keyset slowly over time, like how one learns to operate a car.

The virtuosity and discipline required for Engelbart’s mouse and keyset illustrate his larger ideas about what computers had the potential to do. Engelbart thought computers could help us communicate and collaborate — a total departure from how most engineers thought of computers in the 1950s, which was just as giant calculators.

In the early 1960s, Engelbart got funding to start his own lab. His team of researchers started building entire online collaboration systems, experimenting with video conferencing, collaborative text editing, outlining tools, hyperlinks, and, of course, devices like the mouse and keyset. Here’s Engelbart showing off some of his ideas in something that is now referred to as the “mother of all demos.”

These complicated ideas weren’t particularly popular or marketable, and by the late 1970s, Engelbart’s team ran out of funding to continue their research. Many of Engelbart’s researchers migrated to Xerox PARC (one of the most cutting-edge computing research institutes in its time), as did many of Engelbart’s prototypes.

And that’s how, in 1979, Steve Jobs first saw the mouse (and keyset) when visited PARC.

A dramatization of Steve Jobs’s visit to Xerox PARC in the film Pirates of Silicon Valley.)

Although Jobs found the mouse-and-keyset setup intriguing, he thought it was way too complex. Jobs believed that computers should be as simple and user-friendly as possible. Per Jobs’s directive, Apple’s version of the mouse would have only one button.

Apple never even considered including Engelbart’s keyset in early personal computers. The keyset was too costly, clunky and complicated, and Jobs knew that consumers didn’t want to buy a computer they’d have to learn how to use over the course of many months. Jobs wanted customers to come into an Apple store, look at their products, try them out, figure them out in the first few minutes and buy them immediately. Even today, Apple products are so simple that a toddler can operate them perfectly.

Englebart used to compare the sleek, simplified Apple products to a tricycle. You don’t need any special training to operate a tricycle, and that’s fine if you’re just going to go around the block. If you’re trying to go up a hill or go a long distance, you want a real bike. The kind with gears and brakes– the kind that takes time to learn how to steer and balance on.

Englebart thought that because the consumer market prioritizes simple and “user-friendly” devices over more complex and “learnable” devices, they’ve only been selling us tricycles.

Although, without people like Jobs, perhaps only a few people would be on bikes, and the rest of us would be too intimidated to get on wheels at all.

Though the ease-of-use paradigm has mostly won out, Engelbart’s philosophy continues to influence technologists today. A device called a monome — used mostly for music — is complex enough that even its creators haven’t totally mastered it. One of them, Brian Crabtree, traces its lineage to Doug Engelbart.

The best design may be the one that gives us a clear path to learning if we choose to. Put another way, designs that help us transition from tricycle-riding to bicycle-riding, so that if we want, we can choose to go up some really big hills.