Karl-Otto Bock was an outstanding hobby-micropaleontologist and our co-worker on foraminifera.eu. He had several years of experience in sorting out even the tiniest and inconspicuous microfossils. He was specialized in the production of plummer cell slides with each containing hundreds or thousands of specimens, representing most comprehensively a sample. In 2025, KOB passed away, leaving behind his remarkable collection of 139 slides. FEULAB honors his memory by actively using his slides in outreach activities such as talks, exhibitions, and booths, ensuring that his passion for the microscopic world continues to reach new audiences. .