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On the sign:
פרופ סר פטריק גדס תרי"ד-תרצ"ב 1854-1932 סוציולוג ומתכנן ערים יליד סקוטלנד ציוני נלהב שראה את העיר תל-אביב כבירתה התרבותית העתידית של ארץ-ישראל. בראשית המאה ה-20 תכנן את העיר תל-אביב עד גבולה הצפוני בנחל הירקון
The sign is placed on a dedicated stone pillar in a spherical shape and similar ones are found in many gardens and bridges in Tel Aviv, such as Click for sign's details.
Translation of the text on the sign: Prof. Sir Patrick Geddes 1854-1932 Scottish-born sociologist and urban planner An enthusiastic Zionist who saw the city of Tel Aviv as the future cultural capital of Israel. At the beginning of the 20th century, he planned the city of Tel Aviv to its northern border in the Yarkon River