Above is a picture of the shower in my dorm.
There is no mapping between what you want to do and what is possible - the top knob controls the number of showerheads on, in itself an illogical design choice since there are only two possible showerheads, and the bottom controls the temperature. There is no way to figure out how to control the shower. In particular, learnability and efficiency suffer from the design. Those who have never used the shower before will need to spend time figuring out the non-intuitive mechanics, and the use of the upper showerhead to control number (which is not a ranged value) of showerheads leads to some wasted time spent moving around the knob until it hits one of its three sweet spots (left showerhead only, both showerheads on, right showerhead only).
To solve the issues of the shower, we could replace the top knob with a switch or slide, since there are a fixed number of options (three). Alternatively, we could include some imaging on the knob, the same way the bottom knob has some small labels to explain how to turn the shower on and off, as well as explain the heating settings. Imaging on the top knob could be as simple as three small icons in a radial fashion, to show where to turn the top knob for its three settings.

Above is a demonstration of the way to charge Apple Pencils.
In this case, the design of the pencil is simple, but that comes at the sacrifice of safety. While there is visibility to the set of possible actions, as we can easily see where to charge the pencil on the tablet (only one exposed connector), the pencil sticks out from the tablet at an uncomfortable angle, making it difficult to charge the pencil in my backpack, for example, and effectively impossible to use the tablet while the pencil is charging (lest I be stabbed). Some efficiency is also sacrificed by the loss of ability to use the tablet while the pencil is charging.
To solve the issues of the pencil, we could add a port on the side of the tablet, or offer some sort of extended piece with some wire to charge the pencil from the tablet. However, this comes at the sacrifice of simplicity; users would need to use an additional part to charge the pencil. We can see that this is another example where additional complexity is created when functionality is extended, but perhaps this would be a change worth considering for sake of usability.

Above is a picture taken from this week of the stairs to the side of the Student Center (W20) that I take each day to leave the Zesiger Center.
To be honest, I'm still not sure there's some obvious use to the ramp that I have not realized, but I cannot really understand why a ramp would be placed to the first step (ramp has also not been moved for weeks). If anything required a ramp to be transported, but would then be followed up by an additional three steps, I don't see how there might be much difference in just taking the four steps to begin with. The design of the pathway is completely illogical to me, sacrificing efficiency (why make such a short ramp for the set of stairs?).
The affordances of the ramp are completely not taken advantage of here; the user cannot do much with the ramp if the user has to take the stairs after anyways, so the purpose of the ramp is wasteful, and the pathway is designed poorly. To fix the problematic pathway, one could just offer stairs (ramp-less) and a ramp to the side which extends the height of the entire staircase, rather than a single step, though a larger ramp would be more costly to construct.