Researching for this article I came across the Treehugger post on Ustatic’s Wall Grass Concept. You must understand this concept before you can digest the Hour///Gras Living Wall Clock.
Based on Ustatic’s theory that growing grass at home is beneficial,
this concept clock encourages you to grow either grass or other
suitable plants in a stainless steel and glass body frame and hang it
on a wall. The hour and minute hand pass over the patch of grass and
trim it via their sharpened edges and help maintain a pre-set level of
grass-blade length.
In case you sow wheatgrass, you can consume the trimmings but for any
other plant, just dispose of the clippings which pass through the
grates at the bottom of the encasement into a slide-out container. On
maintenance point of view, a watering basin is located at the top right
corner of the frame and Ventilation grills run along the top of the
structure.


