I can never plus my fan and lamp at the same time

We plus most of our electric appliances while using them. But sometimes, the situation is kind of tricky.

This is not always the case, but sometimes it happens.

Uhh, as you can see, it is a socket with one three-pin and one two-pin, and I am trying to plug in one three-pin plus and one two-pin plug at the same time, which obviously cannot happen here.

Because the cable grip is on the bottom of the three-pin plus, which conflicts with the location of another plus below it, I cannot plug them at the same time.

How is it supposed to be?

Here are some better examples.

For the design of socket, while you want to make sure your users can really get access to use all of your socket holes, give them enough space by thinking of how to use space flexibly.

For the design of plus, while you never know where your users will plug them in, making the plug will never take over other pluses’ space would be the smart way. Like in the picture below, the cable grip of plus is perpendicular to the socket plane, so it would not be a conflict with the space of another plus.

In summary, while designing for a product, only thinking put all function together might turn out they do not work as you expect. Being human-centered and context-centered, consider how the experience will be when users are using it will improve the usability of the product.