Ryogin-an iterally means "Dragon Rising". The garden is a stone arrangement with black and white gravel is interspersed with the stones. The bamboo fence is used to show thunder and lightning arcs on the outside and nested geometric shapes that symbolize thunder, but is no longer there. The stones represent a dragon as its body weaves in and out of the storm clouds. The major grouping is the head. As you walk along the west side, you can supposedly see the dragon moving.
Please note that Shigemori did a 2nd garden here, called Tofukuji Hojo
A bit of water here,
There, between the trees -