It seems that the first and most imaginative use of practically every material was, before quite modern times, in making something decorative. People are experimentally minded when looking for decorative effects, but they can’t experiment with the established techniques on which their livelihood depends.
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It is of basic significance for human history that, from the cave paintings on, almost all inorganic materials and treatments of them to modify their structure appear first in decorative objects rather than in tools or weapons necessary for survival. Aesthetically motivated curiosity, or perhaps just play, seems to have been the most important stimulus to discovery.
A personal site offers a dedicated place to experiment across the entire tech-stack; not a deliverable for a client that is handed over and then never touched by me again. A personal site is a place to try out that new API, see what can be done with CSS, truly discover what the Web can be.
Every attempt to cul-de-sac city streets, to change traffic patterns in favor of pedestrians, or to narrow street ends is met with the same howl of protest from the authorities: this will increase congestion because urban traffic is a zero-sum game. Any reduction in volume in one place in the city will inevitably be accompanied by a rise in traffic somewhere else.
This claim is fallacious: the true corollary is the opposite. In case after case, a reduction of the space available for vehicular traffic has simply resulted in the reduction of traffic overall.