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1.
This experiment is an attempt at giving the user the impression that the visible DOM elements of this page are materialized in an environment in which he understands the rules. By giving the simulated environment physical properties similar to those of our world and by representing some DOM elements as physical entities in this environment, it is possible to create the illusion that the boxes of content are bound to the same properties as the walls of the real world, thus materializing them.
2.
Adding pseudo-living creatures to this environment also enforces the feeling of plausibility of such an environment. It is important that the different components of this virtual universe behave in a manner that is similar to what would happen if we were truly moving physical entities in reality. In that matter, you can try to resize the window of your browser while staying in this experiment to notice that the bounds of the virtual world are the same as those of the window. The more there are components interacting with each other, the more realistic the experience will feel.
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Summary
2. Materializing DOM entities
summary