The unused corner becomes useful when somebody measures what might fit there.

Dead space stays dead because nobody has asked a specific question about it. The corner has been there for years being nothing, and the moment someone takes a tape to it, it turns into a set of options: a shelf this deep, a chair this wide, a desk if you lose the skirting. Possibility usually arrives through measurement rather than imagination. Vague potential is not potential you can use.

Take one neglected thing this week and get the actual numbers. The corner, the hour between two commitments, the budget line nobody looks at. Specific dimensions turn it from an idea into a decision you can make or reject.