  We determine a smooth Euclidean 4-geometry on R^4 from quantum interacting
spin matter like in the multichannel Kondo effect. The CFT description of both:
the $k$-channel Kondo effect of spin magnetic impurities quantum interacting
with spins of conducting electrons and exotic smooth R^4, by the level $k$ WZW
model on SU(2), indicates the relation between smooth R^4's and the quantum
matter. We propose a model which shows: exotic smooth R^4_k generates fermionic
fields via the topological structure of Casson handles and when this handle is
attached to some subspace A of R^4 these fermions represent electrons bounded
by the magnetic impurity. Thus the Kondo bound state of $k$ conducting
electrons with magnetic impurity of spin $s$ is created like in the low
temperature Kondo effect. Then the quantum character of the interactions is
encoded in 4-exoticness. The complexity as well the number of Casson handles
correspond to the number of channels in the Kondo effect. When the smoothness
structure is the standard one, no quantum interactions are carried on by
standard R^4.
