This desk lamp by Berlin studio Böttcher+Henssler for Slovenian lighting brand Vertigo Bird can be adjusted by sliding the aluminium tube through a hole in the maple base and kept in place by gravity alone. 

Called Mantis, the task light has warm white LEDs housed in a hollowed-out, lightly stained maple case.

The new product will be presented in Frankfurt this April.

WE've featured a few lamps by Vertigo Bird on Dezeen - see all of them here.

Here are some more details from Vertigo Bird:

MANTIS is an elegantly simplified variant of the iconic desk lamp, made of lightly stained solid maple. The lamp uses energy-saving LEDs placed with precision to provide a natural like warm white light emanating from a hollowed out wooden fixture. The simplified usability comes through in the mechanical principle which relies on gravity to fix an aluminum tube that has been inserted through a wooden stem attached to its base. With this minimalist principle in mind one can effortlessly swing and adjust the height displaying the intended delicate balance, lightness and playfulness of the design. In its symbiosis of clear lines, the natural character of the wood, the colourful accent of the textile cable and coated aluminum tube, MANTIS is a timeless piece to compliment any modern home and office interior.