During the prototyping phase we experimented 2 different options for adjusting the height:
1) 2 sizes of legs (the plain wooden part) and 2 sizes of feet (smaller painted ending). The combination of them give 4 different height (this is what it is shown in the video)
2) 4 sizes of feet that you can simply screw into the legs
At the end we considered that as for the kickstarter backers wanted to offer all 4 heights at once, space might have been a concern, so the second option was the one that prevailed.