In Smalltalk you typically work in an image where all the objects live and can be changed. So an image is an object memory snapshot that is maintained over time and that includes new and old objects (some of them may date back to ST-80 times).
Yoshiki Ohshima was playing with John's MicroSqueak and created a bootstrap Compiler - a first step to (re)create a Squeak image from simple "text files".
More about it here and in the README.
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