Tacit programming... What?

An example writte in the J programming language:
<<
Here's a J program to calculate the average of a list of numbers:

avg =. +/ % #
avg 1 2 3 4
2.5

'#' - counts the number of elements in the string. '+/' - adds up all the elements in the string. '%' - divides the sum of the elements by the number of elements.
>>

Amazing! The idea seems to be: you do not specify the parameters, only the functions to apply... :>

I have to get the specs (especially of the semantics) and see how they implemented it. It looks very "different".

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Some fractals in J
http://www.jsoftware.com/jwiki/Studio/FractalsVisualizationJ

And even more graphics, math and fractals in J
http://ww2.lafayette.edu/~reiterc/

PLaSM
functional language for computing with geometry
http://www.plasm.net/index.html