Ideas are like tennis balls at the outset of the week. You and a couple comrades are tossing them back and forth, for fun, to see what comes of them. The ease of a luxurious afternoon game defines Monday, but Tuesday and Wednesday are high-energy and magnetic. You are radiant. The larger issues of the day -- current events, that is -- are on your mind on Thursday, and your thoughtfulness leads you into philosophical terrain. Philosophy figures strongly on Friday as well. This weekend, a couple of business matters occupy your mind and your calendar.