Now that the fabric is starting to come down onto the cloth beam, I can give you a view of the other side of the fabric. I am weaving it with the light, or "summer", side facing me as I weave. Here you can see the dark, or "winter", side.
When woven in its tradtional manner, Summer & Winter typically has this characteristic, where one side is predominantly light, the other dark. The white warp dominates in some places, forming the light areas. Where the darker pattern colors float over the warp, the dark areas appear.
The dark/light feature is presumably where this weave structure gets its name. Other structures can produce this reversible dark/light effect, but for some reason this one got the name "Summer & Winter".