Each lamp has a 4in opening in the bottom once you unscrew that simple base Wingnut and insert you fill it with shells or any other filling you would like. I found some shells here in Clearwater Beach to give you an example of what they could look like full of beautiful seashells.
Now it's your job to hit the beach and fill them with shells. You do not find these lamps very often and when you do they are very expensive. The item "Pair Of 1970-80s Hollywood Miami Modern Glass Huge Clam Shell Table Lamps" is in sale since Tuesday, April 30, 2019. This item is in the category "Collectibles\Lamps, Lighting\Lamps". The seller is "islandglassgallery" and is located in Largo, Florida.
This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Philippines, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Ukraine.