הגלריה און לייןמילון מושגים באמנותאבן הראשה keystone

אבן הראשה keystone

אבן הראשה, או "אבן ראשה" - keystone - היא החוליה העליונה בקשת.
בעבר, כאשר בנו קשת ממספר לבנים, אבן הראשה היתה האבן האחרונה שהונחה ו"נעלה" את הקשת. לאבן הראשה נודעה חשיבות גדולה, שכן בלעדיה הקשת לא יכולה להשאר יציבה.
צורתה של אבן הראשה היא לרוב מנסה טרפזית הפוכה. פעמים רבות נהגו לקשט את אבן הראשה ולייחד אותה משאר אבני הקשת.

שרטוט של אבן הראשה בקשת

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עיצוב אתרים

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