One of the adventure-games of Lucasarts which took a different approach at adventure-gameplay.
In Loom you take over the control of Bobbin Threadbare, a member of the guild of weavers.
There is no inventory whatsoever, the only thing you're equipped with, is a magical staff.
With this staff you can cast tunes (or spells if you like; you just need to click on a certain part of the staff to play a note; four notes will make a tune).
As you progress, you learn more and more tunes which you can cast onto different items, persons or other objects.
I really like the mysterious and strange fantasy-world, though the game is not very long, nor is it very challenging (if you did played some old-school adventures) but still, for me Loom is a rare pearl in adventure gaming.
Sadly, the plans to make it a trilogy were never fulfilled, so it feels a but unresolved at the end.