Sightlines are essentially the imaginary line of sight between an observer and an object. There are various synonym phrases for the word sightlines such as "line of vision," "field of view," "range of sight," "viewing angle," "perspective," and "observation angle." In architecture and interior design, sightlines are crucial to ensuring functional and aesthetic spaces. Sightlines can help create a sense of openness, highlight focal points, and improve safety. A well-planned sightline can enhance the user experience, improve accessibility, and optimize the use of space. As such, using synonyms for sightlines can help communicate these design elements more effectively.