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What can be behind the door in your imagination?

this challenge needs more people to join! :) —  Riff
@Riff, do u mean to extend this challenge? —  Innocent Sylph
i don't know how long it is supposed to last, but it was a good idea and i hope it'll inspire some more people :) —  Riff
thanks Riff, i hope so... :) —  Innocent Sylph
"There are all kinds of interesting questions that come from a knowledge of science, which only adds to the excitement and mystery and awe of a flower."
Richard Feynman
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