George Whitesides, professor of chemistry at Harvard. Objects have their own simplicity of function, but not of form. A cellphone has a very simple function, easily recognisable but with a highly complex structure. Asking 'why does it work?' is not the same as asking 'how does it work?' The former can be answered by saying 'it works because I dial a friend's number', the latter by an initial discussion about microwave transceivers, all but unintelligible to anyone other than an expert in microelectronics. So, the complexity of the device is sufficiently intractable to obscure the simplicity of its function. A traffic flow system is at component level, a matter of interlocking straight lines, from journey beginning to end. In a complex system, weird stuff happens if its components continue to be allowed to dissipate energy, which is why people are late for work. A paradigm emerges where chaos seems inevitable and simplicity is lost. We don't like this, as a species. We don't like imperfections in our systems, we prefer that each system that we build works perfectly and if it does we can overlay it with another one. Looking at the bitrate map across the world is phenomenally complex, but a Google front end, on the other hand is simple and reliable, it works because I type stuff into the box.
Cathedrals and pyramids are built out of stones, but if the stones do not fit perfectly, the stones become a pile of rubble and the function of the cathedral is lost. I sometimes delude myself into believing that human psychological systems rely on all the components fitting together perfectly. When they don't and mismatch occurs, a systematic dismantling may be preferable to a pile of rubble.
The image is of a Shaker chair.