Congratulations to Paul McCarthy, who shared this wonderful image of kite surfers harnessing the power of the wind as part of our Forces project. Take a look at our other favourites in our online gallery here.

This month, we would like you to get snapping on the theme of Scale. So whether it is rising mercury within a thermometer, a tiny insect on a buffalo's back or the view from an immense height, we'd love to see your photographs and hear how you took the shot. Our favourite will appear in the July issue.

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 6 July.