No 7 could be a cross-section of underwater cable. I was going to answer more but the 3 million colours in No 11 have given me a headache!
There's no fooling you Rog! (even though you seem to be looking through three eyes). You're right on No. 7 but No.11 has only one million colours. You will have noticed that the main pattern is in a 10 X 10 squares format and each of these 100 squares is also registering a 10 X 10 sub-format of smaller squares each containing a 100 minute squares of a unique colour tone providing 100 X 100 x 100 = 1,000,000 shades of colours not easily distinguished at this resolution. Sorry about the headache ~ I've posted a picture of and aspirin under it.
Most thoughtful Crowbard!
1. a 1 litre plastic bottle before final inflation.2. 17 abandoned or derelict (in the older meaning that their crews had all died) hulks which have drifted onto a sand-bank in the Bermuda Triangle3. an interesting demonstration of the cantilever principle; no glue was used but it is easier if you use a supporting template while assembling the coin-stacks.4. a Dutch ivory snuff-box5. a Chinese ivory snuff-bottle6. a Chinese ivory carving of Kwan-yin (the Chinese goddess of mercy) with a seated chid8. The Crozier of Saint Servatius: wooden staff with gold mount and ivory crook (12th century)9. a carved bone soap-dish10. an Esquimeaux/Eskimo/Inuit carved walrus-ivory otter