Congratulations to alexandra1108 who shared this wonderful image of a rusty iron thresher as part of our elements project. Take a look at our other favourites here.
This month the theme is Forces. So whether it is a horse pulling a cart or pulleys hoisting a load, share your photos and tell us how you took the shot. Our favourite will be seen in the June issue of Observer Tech Monthly.
To contribute your images, click on one of the blue 'Contribute' buttons, or you can download the GuardianWitness smartphone app. We will print our favourite in the next issue of Tech Monthly and compile an online gallery to boot. Closing date is 26 May 2014.
