If google and IBM were brighter than they are now, they would buy out this app just to get at the list of app users.
The simple fact is that people interested in these sorts of mathematical entertainments are likely the best human feedstock for creative engineering, and development, or creative positions.
Minds that joy such diversions are wired better ...or at least differently.
Now... How many of the examples are not physically correct in a stiff 3-space iplementation?
Can you tell?
A few projections of spatial geometries from n-space to 3-space might be interesting to use as evaluation tools for complex spatial comprehension.
Fun for a wide range of audience, from youths, to adults.
Chuchilla about iCrosss, v1.4