If they come into my den then the only light comes from my monitors.
So they crawl along the ceiling till they are above my desk then drop down to investigate the pretty lights.
They then stop just in front of my eyes or plop onto my keyboard.
One actually fell into my coffee a week back...
Now these guys are between 4 and 6 inches across.

Usually not aggressive unless protecting an egg sack but still, they are a bit creepy if you are concentrating on the screen and they appear as an out of focus eight legged blob in front of you.
If they plop onto the keyboard they scurry off looking for a hidey spot so they can jump out and go "Boo!" later on.