Those rather experimental Images are from a group of huts, build of willow branches in the nearby woods. It is a popular childrens playground. The editor choses to call them Troll Huts.
In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm.
When filters are used together with infrared-sensitive film or sensors, “in-camera effects” can be obtained; false-color or black-and-white images with a dreamlike or sometimes lurid appearance known as the “Wood Effect”. This effect is mainly caused by foliage (tree leaves and grass), strongly reflecting as visible light is reflected from snow. The effect is named after the infrared photography pioneer Robert W. Wood, and not after the material wood, which does not strongly reflect infrared.
The other attributes of infrared photographs include very dark skies and penetration of atmospheric haze, caused by reduced Rayleigh scattering and Mie scattering, respectively, compared to visible light. The dark skies, in turn, result in less infrared light in shadows and dark reflections of those skies from water, and clouds will stand out strongly. These wavelengths also penetrate a few millimeters into skin and give a milky look to portraits, although eyes often look black.
The Editor decieded to remain with his preference for Black & White imagery. Those photos are produced with a FujiFilm X100T using Hoya R72 Infrared Filter.