# On Display Is a Calendar, Not a Place > The Art Institute of Chicago owns three impressions of the Great Wave and on 7 September 2026 none of them was on view. For light-sensitive material a permanent collection is a rota, and where an object is and whether it can be seen are two different facts. > The Study - 2026-09-07 > Canonical HTML: https://iconotheca.com/study/on-display-is-a-calendar-not-a-place/ ## Key points - Checked on 7 September 2026 through the museum's own public interface, all three of the Art Institute of Chicago's impressions of Hokusai's Great Wave, accessions 1925.3245, 1928.1086 and 1952.343, return is on view false with no gallery assigned. - The Nezu Museum showed its National Treasure Irises screens from 11 April to 10 May 2026. Allowing for the Monday closures that is 27 open days, about 7 per cent of the year, and it is the reason the screens have survived three centuries on paper. - The Canadian Conservation Institute's guidance sets 50 lux as the museum benchmark, chosen sixty years ago because colour science had established that the eye is still within full colour vision at that level, and defines exposure as lux multiplied by hours. Damage is proportional to intensity, so the currency is not brightness but dose. - The Hereford Mappa Mundi is held at 25 lux, half the benchmark, in a case built around one object at a constant 17 degrees Celsius and 55 per cent relative humidity with ultraviolet-filtering glass throughout. - Scroll one of the Kibi Daijin emaki at the Museum of Fine Arts, Boston, accession 32.131.1, is 804.9 cm long overall and its record reads NOT ON VIEW. A handscroll cannot be shown whole even in principle, so what a visitor sees is always an editorial selection made by a curator. - The Niepce heliograph is permanently on view at the Harry Ransom Center in a sealed, monitored, oxygen-free case, and a visitor photograph of it in that case shows a grey sheen and a reflection. The first photograph is one of the most continuously displayed and least visible objects in any collection. ## Where an object is and whether it can be seen are two different facts ## The benchmark is fifty lux, and what accumulates is dose rather than brightness ## Three impressions of the most famous print in the world, none of them on view ## A National Treasure with a season of about four weeks ## A handscroll cannot be shown whole, so what you see is an edit ## Twenty-five lux, and a case built around one object ## The first photograph is permanently on view and almost invisible ## What the rota does to the exhibition record ## How to read on view ## Why this archive is free to read A collection record gives you a room, and for a very large part of what museums own the room is the least useful thing it could tell you. The Art Institute has three Great Waves and had none of them out on the day we looked. The Nezu opens its Irises for twenty-seven days and closes them for three hundred and thirty-eight. Hereford holds its map at half the benchmark and shows it every day. These are not accidents of scheduling, they are different answers to a single equation of dose against access, and the answer an institution has chosen is the fact a reader actually needs. So record the on-view flag with the date you read it, look for the exhibition calendar rather than the gallery number, and where you can establish a rota, publish it beside the location, because for these objects the calendar is the address. ## Questions **Why are prints, drawings and textiles so rarely on display?** Because light damage to organic colourants is cumulative and cannot be reversed, and the dose is intensity multiplied by time. The Canadian Conservation Institute sets 50 lux as the museum benchmark and treats exposure as a budget in millions of lux hours, so an institution can show a sensitive object brightly and briefly or dimly and continuously, but not brightly and continuously. **Is the Great Wave on display at the Art Institute of Chicago?** Not when we checked. On 7 September 2026 the Museum's public collection interface returned is on view false, with no gallery assigned, for all three of its impressions: 1925.3245, 1928.1086 and 1952.343. Japanese print galleries rotate on a cycle of weeks, so this will change. **How often can you see Ogata Korin's Irises screens?** About a month a year, in spring. The Nezu Museum showed them from 11 April to 10 May 2026, and with the Monday closures that is 27 open days, roughly 7 per cent of the year. **What is 50 lux, and why that number?** It is an illuminance level, roughly that of a dimly lit room. Stefan Michalski's account for the Canadian Conservation Institute records that it was adopted about sixty years ago because colour science had established that the eye still operates within full colour vision at that level, so there was no purpose in going lower. It is a floor for seeing, not a level proved safe. **Can a handscroll ever be shown in full?** In practice no. Scroll one of the Kibi Daijin emaki in Boston is 804.9 cm long on its own, and there are four scrolls. A display case shows a passage, so any exhibition of an emaki is an editorial selection of which scenes the public will see. ## Sources - [1] Stefan Michalski, Agent of Deterioration: Light, Ultraviolet and Infrared, Canadian Conservation Institute. Read for the origin and meaning of the 50 lux benchmark, the definition of exposure as lux multiplied by hours expressed in millions of lux hours, the statement that the rate of light damage is proportional to intensity, the effect of age on the light a viewer needs, and the framing of the dilemma as a balance between the rights of our own generation and those of all future generations. - [2] Art Institute of Chicago, public collection API, artwork records 24645, 89503 and 77333, corresponding to accessions 1925.3245, 1928.1086 and 1952.343. Queried 7 September 2026 for the is on view flag and gallery title; all three returned false with no gallery. - [3] Nezu Museum, Tokyo, special exhibition page for The Korin School: The Irises and Ogata Korin's Followers, marking the museum's eighty-fifth anniversary. Read for the exhibition dates of Saturday 11 April to Sunday 10 May 2026, the Monday closures with the exception of 4 May, the galleries used, and the presence of the National Treasure Irises screens. - [4] Nezu Museum, Tokyo, collection entry for Irises, item 10301. Read for the designation, the medium of ink and colour on gold-foiled paper and the dimensions of 151.2 by 358.8 cm for each screen. - [5] Museum of Fine Arts, Boston, collection record for Minister Kibi's Adventures in China, scroll 1, accession 32.131.1. Read 7 September 2026 for the overall length of 804.9 cm, the medium, the catalogue raisonne reference and the NOT ON VIEW status. - [6] Harry Ransom Center, University of Texas at Austin, The Niepce Heliograph. Read for the object's display in a sealed, monitored case, the 2002 Getty Conservation Institute study and the new case, the return to view in spring 2003, and the history of the 1952 Kodak copy print.