The photos that you see above and below are the work of Heather Ackroyd and Dan Harvey – the medium is living grass. The pair created the portraits by covering seedling grass with custom-made negatives, which presumably filtered the sunlight to varying degrees allowing the details to be “printed” onto grass.

The images on the grass are temporary – over time, as the grass grows and with the negative no longer filtering out the sunlight, they disappear.

[Source via PetaPixel]