Douglas Engelbart installed two cameras at the Stanford Research Institute (SRI) in Pala Alto at the time and two others at the San Francisco Civic Center to demonstrate sending and receiving messages by banging his colleagues at the SRI. Standing on stage, he showed participants clicking and jumping on the computer screen with a mouse. Using a mouse, the text was linked to hypertext on the screen and showed all the features of hypertext that split the screen into multiple windows or instantly showed related documents.
The reason why he made the mouse was that he wanted to create layered documents such as titles, subheadings, and texts like books. This is the same as the way CSS is expressed on the web. He came up with ‘non-linear editing’ to interact through the machine. If you want to add a sentence to the previous paragraph, you have to move the cursor there. Word processors made to realize rapid thinking in reality needed tools that could make a leap forward. The keyboard could not meet this, and he developed his own mouse, a tool needed for nonlinear editing. He did not conceive of a mouse from the beginning. I found other ways to use my knees and head so that both hands would not deviate from the keyboard, but it was not efficient. In the end, he thought that the mouse using the hand was the most reasonable way, and I think his judgment was right.
