A reading stack is an invitation, not a test of ambition. Mixing pace, length and subject can make it easier to choose a book when attention is uneven and the day has left little room for concentration.
A small book asks for close attention. Paper, binding, type and margin become part of an object held near the body. Its scale can make a short piece of writing feel complete without trying to make it look larger.
A marginal note can turn reading into a conversation with your future self. It need not be clever or complete. A question, a connection or a mark beside a sentence may be enough to help you return.