Suggests that life has balanced itself - human life is process of writing/erasure/beginning again.
"waving away the blackboards hieroglyphics with a damp cloth"
Impermanency, peace in that suggests it is embedded in history, wiped away because it can be easily retrieved. Links to use of "hieroglyphics" to describe maths - long tradition of working through problems.
"how he'd change from his suit into overalls"
Symbolic - different dimensions of his life, change of clothes represents a change of activity which he finds joy in.
"like a magician whose tricks are just the way of things"
Natural and unchanging reliance on the way things are. Magic in the mundane nature of things. Symbolic - spiritual quality to the seemingly mundane.
"one egg, warm and bold in his brown palm"
Enigmatic one-line stanza, made up of monosyllabic words - simplicity.