Sun-following Garden Mirrors?

from blog Jeff Kaufman's Writing, | ↗ original
A friend of ours across the street has a small front garden, but since we're in Boston, their house faces north, and it's three stories tall the garden gets almost no direct sun. [1] Could we fix this with a mirror? If I put a static mirror on the front of our house, even on an angled mount, it would only send light to the garden for a short...