I returned home for a one week "break" and placed my laptop in its usual place.
That night I spotted this spider with its web between my mouse and the tabletop:
A sideway shot to show this isn't just some dirt on the ground. Here you can faintly make out is legs.
I destroyed its web because I needed to use my laptop. A few days later it made another web quickly near the keyboard of my desktop. I decided to put it out of its misery of waiting for flying insects that will never come into my room. Plus it was getting irritating.