At the University of California, Berkeley, there is an exhibit of his drawings.
The exhibit won't be there forever and the link may disappear soon, so get yourself there if you want to see Intuitions
of Supersensible Realms Visualized.
This is but one of many features we intend to bring to you
to encourage you to use drawing and sketches to illustrate your own intuitions. We are indebted to Ingo Swann for
first making this suggestion.