Contemplation: Mind-Mirror

First review the guidelines for practice, and then take this up as your object of contemplation:

The mind mirror illumines all ingeniously.
Its penetrating, limitless rays reach everywhere in the universe.
Without exception everything is reflected in this mirror.
The whole universe is a gem of light beyond the terms of in and out.

Sho Do Ka, quoted in Buddhism and Zen by Nyogen Senzaki, p. 57.