Helping you visualize...

SELECT * FROM gallery2 WHERE topic_id="1453570" UNION SELECT * FROM gallery2 WHERE topic_id="1511453" UNION SELECT * FROM gallery2 WHERE topic_id="228668" UNION SELECT * FROM gallery2 WHERE topic_id="9261" UNION SELECT * FROM gallery2 WHERE topic_id="1822849" UNION SELECT * FROM gallery2 WHERE topic_id="1580394" UNION SELECT * FROM gallery2 WHERE topic_id="460972" UNION SELECT * FROM gallery2 WHERE topic_id="908440" UNION SELECT * FROM gallery2 WHERE topic_id="1367250" UNION SELECT * FROM gallery2 WHERE topic_id="1446212" UNION SELECT * FROM gallery2 WHERE topic_id="1095795" UNION SELECT * FROM gallery2 WHERE topic_id="816633" UNION SELECT * FROM gallery2 WHERE topic_id="1169461" UNION SELECT * FROM gallery2 WHERE topic_id="1617527" UNION SELECT * FROM gallery2 WHERE topic_id="639167" UNION SELECT * FROM gallery2 WHERE topic_id="1031861"