Very often, we see a tree put alongside a building as a complimentary object, but rarely have we thought about comparing them, and sometimes don't even think they're related.
Ito was one who explicitly took the motive of trees on the street as the facade of his Tod's Omotesando building, despite rather superficially in my opinion, one can see from here the fact that there're times when a building and a tree would have similar scales and proportions. This much is probably as good as it needs to establish some sort of connection.
The thing is - subjectively speaking from my personal imagination - while sharing similar scale and proportions, one feels comfortable and relaxed under the tree but not so much when under/out by the building. Perhaps it is too hard to put the two into a direct comparison. Instead, I would like to talk about a few things on 'Tree' only, hoping at the end some hints to building-making can possibly come into view.
A tree does not have a facade. Its outer layer is just where the entire figure stops growing and expanding. Being away from, under or up on the tree has a rather similar sensation in that its expression does not change drastically. In order words, it is a smooth, gradual and continuous transition of space that never completely cuts away from one another.
2. Porous and Transparent
A tree is probably one of the most porous being under earth's elements. Sunlight, wind, rain, insects and animals gently and freely pass through it. Within or under a tree exists a micro environment that is at once individual while highly in-sync with the greater natural environment. The porosity also enables good visual extension into or out from the tree, which I thought is simply intriguing and interesting.
3. Green and Differed
Being largely green in colour makes a tree simply the most eye-soothing and relaxing thing to look at. Besides, like human being, no two trees share identical look and form. I personally find it interesting on how each trees gives different, suggestive images that intrigue our imaginations much more than the solidity of buildings blocks.
'Tree' is one of the first terms we learn as a child and hence it almost never occur as a strange existence to us. Tree seems so ordinary (and kind) to us that sentiments toward it easily born into our minds. Hence, there're many who thought of certain trees as important aspects of their respective (childhood) memories.
5. A Link to the Environment
Many times, we look at the tree to find out if it's raining, windy or sunny outside. A tree reacts to the environmental conditions throughout each day, each season. Without noticing, we always casually relate to the natural environment through the tree right outside our windows, visually and mentally. Buildings, on the other hand, tends to distinct themselves from the nature.
I’ve thus far managed to come up with the ‘5 points of a Tree’ (high 5! Le Corb) that seem to have been only describing a tree, but probably a relationship or idea can sometimes be best found in the least obvious ways and the least forceful references.
One can try to achieve the quality of a tree in a building in many ways, and probably there have been quite some a of examples already, especially amongst the so-called sustainable architecture. But looking at my points one should understand that I tend to contemplate a tree not in its functionality, but its spatiality. A completed example I would most appreciate currently is the Tama Art Library in Tokyo, again by Ito which I feel, has certain qualities of a ‘tree’ far more implicit & effective than that of the Tod’s mentioned at the start.