but something was there , in the back of her mind , a picture of the future taking shape : it started as a faint nagging on her senses , like a slight , low-frequency buzzing ; then it seeped in deeper , and it felt like a dream long after its been dreamt , where details remained - colors , emotions , wisps of movement , vague faces - but the details were n't grounded , they were ethereal , intangible ( a gazebo , sunlight through the branches of an oak tree , the color red but one too bright to be blood ) .