Instant
The root of a stamp is to get an instant picture down. Back in the olden days, people had to make seals and draw out things by hand, so stamps came about so you can—BAM—just stamp it and have what you want in an instant.
Lots of things have roots from wanting to have something in an instant. Just think about instant ramen. The root of that was to get ramen real, real fast. Similar to stamps, ya know?
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Think about the thing you want to make instant. I'd want instant socks (そく)! Don't waste time searching for a matching pair or pulling them on. Just take out a pair of instant socks, add water, and the socks are already on your feet. In an instant!
Imagine using instant socks. How do they feel? Soggy, but hey, it was fast!