A tractor is a vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery used in agriculture or construction. Most commonly, the term is used to describe a farm vehicle that provides the power and traction to mechanize agricultural tasks, especially (and originally) tillage but nowadays a great variety of tasks. Agricultural implements may be towed behind or mounted on the tractor, and the tractor may also provide a source of power if the implement is mechanised. Another common use of the term, "tractor unit", describes the power unit of a semi-trailer truck (articulated lorry).The word tractor was taken from Latin, being the agent noun of trahere "to pull". The first recorded use of the word meaning "an engine or vehicle for pulling wagons or ploughs" occurred in 1901, displacing the earlier term traction engine (1859)- Wikipedia

Made from 100% cotton this dark green t-shirt features an image of Green Lantern rendered by artist Doug Mahnke flying in front of his very own logo! Green Lantern is quite the instigator of epic DC Universe events. Yep. It's like every other day GL is battling some color blasting malcontent or....the sentient personification of universal death. And then all this dimensional distress has the gall to interfere with the lives of other DCU stalwarts. I mean Superman's busy enough. Last thing he needs is a fractured take on a power ring pilot throwing babies through water towers while Luthor's pontificating on a rooftop with reverse-engineered Kryptonian doomsday machinery set to evaporate Metropolis. Please keep the cosmic drama on a leash GL!

These 2 guys must really like Superman. They're working hard on this Superman Wall Mural Painters T-Shirt bringing Superman to life on one hell of a canvas! This bright and colorful image of a classic man of steel with stylish art deco lettering is printed on a 100% cotton yellow t-shirt. While other t-shirts are printed using some vast network of cold machinery this tee takes a hands-on approach to the extreme with the help of....2 citizens from the bottled city of Kandor! 'Cause they're tiny? You still don't get it?

Made from 100% Cotton this white t-shirt features a black and white image of a slightly modified Iron Man armor taken from the hit film Iron Man 2! Check out the triangular window to the Arc Reactor! Check out the modified and extremely superior @$$-kicking software! The Iron Man is a system in a constant state of evolution; state of the art machinery meeting the needs of man with the capabilities of technology!

Made from 100% Cotton this blue t-shirt features the classic Fantastic Four symbol! Remember when "Dimension R" opened up in the middle of town and those horrific bee-like humanoids started suffocating people with honey launched forth from their salivating maws? Remember who dropped the hell down with some crazy-@$$ machinery and a rather rough-skinned looking fellow waxing about his Aunt ...Petunia I think it was? Yep it was the Fantastic Four and they pulled you and your family out of there before the crap got too deep. Well in this case the honey. HAH! This Fantastic Four tee is made with a higher thread count meaning it's noticeably softer then the average t-shirt and a bit more form fitting. This is a high quality t-shirt that absolutely glorifies Marvel Comics' first freakin' family!

Deus Ex Machina by Dan Rule. clouds, hands, robots, deus ex machina, dan rule, machinery, science, invention

We've selected the finest works of metal and machinery to grace the front of this A-Z Robots tshirt. From heroes to foes and everything in between, we've got all your favorite robots on display. Whether they're here to save the world or usher in the end of days, our robot tees are guaranteed to represent. Quiz your friends or challenge yourself to see how many robots you can name. Think you can you name them all?

"Sweden. Source of tasty meatballs, flat-packed furniture, and Hans. Also, home of Mojang AB, the company that provides our current addiction, Minecraft. But you already knew that. However, did you know that the impossible object on this shirt is also Swedish in origin? Yep. Created in 1934 by Oscar Reutersvärd, the tribar optical illusion in question makes this what our Bacon Salt Merchant calls ""The Headache Shirt."" Don't mind him. He's just bitter that pigs drop pork which can be turned into cooked porkchops but not bacon. Which is a good thing. Because if there were virtual bacon in Minecraft, we'd never see him again. Nine blocks of diamond ore arranged in a tribar on this black, 100% cotton t-shirt. By purchasing this shirt, you agree that ThinkGeek waives responsibility for any headaches it might or might not induce. Do not operate heavy machinery while under the influence of this shirt. We recommend you stick with the pickaxe.".