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Please suggest a main model for the same which is soul for topology.

It would be better if it is a working interactive model (hands on) .

Please give suggestion.

If we couldn't get a good main model then we will have to change the theme to one with a good main model.Here are some other theme we come up with:

1.Tilling and symmetry [Spidron]

2.Graphs & Network [Bridge of konigsberg]

3.Ancient Math

4.Numbers

5.Cryptography

Please suggest a theme with a good main model for our expo and some really good model for topology.