I confess that I snickered when I read the various answers. Considering I do not view my studio as a play room, and do not view my tools as "toys," I was less than impressed with the answers.
"What's the one tool in your sewing studio you couldn't live without?"
Rotary cutters got a lot of votes, as did rulers, irons and other gizmos and doodads. As far as I was concerned, nobody got the only truly correct answer.
My decidedly biased answer: "My brain."
Because, if you haven't got a "magical" tool, you can use your noodle, your little grey cells, your thinking cap, your brain, to solve any problem. Very versatile tool, that. And we all have one!
So when I got home tonight and looked at the blocks on my design wall and considered how I might rearrange them to get the effect I wanted with the least amount of effort, (translation: how could I play with the blocks without climbing up and down the ladder to move 117 blocks), in the end I decided not to touch them at all.
Did I "settle?" Certainly not. This is the design that's up there now, with the colors rearranged slightly (without the contrasting strip in the center of each block):
So how did I do all this while sitting on the couch?
Now I am fairly sure that a lot of you have one of those fussy quilt design programs, but I do not, because I don't make quilts that use a lot of the same block over and over again. Years ago one of my readers commented "You have the best fabrics."
"No," I replied. "But I know how to get the most out of the fabrics that I do have." It's the same thing with tools. You don't need lots of gizmos and gadgets (and trust me, I have a lot of them), but you can get a lot of proverbial "bang" for your "buck" if you can make them do what you want.
Even if the number one computer spreadsheet software on the planet wasn't created to design quilts.
The little grey cells...
(I love each and every one of them.)