Unwanted echoes usually occur as distributed clutter, as surface clutter (such as land and sea echoes) or as volume clutter (such as rain, chaff).

But Miss Thorn relieved the situation by laughing aloud,[…]. We began to tell her about Mohair and the cotillon, and of our point of observation from the Florentine galleried porch, and she insisted she would join us there.

There is a sharp and effective contrast between the incisiveness and energy of his speech and the vaguery and haziness he is attacking.

Perhaps the reader will wonder why we have placed our beings on a sphere rather than on another closed surface. But this choice has its justification in the fact that, of all closed surfaces, the sphere is unique in possessing the property that all points on it are equivalent.