It seems crazy to want a lava lamp as part of the decoration in a early 20th century house, but there it is. A cry from the wilderness of the 1960s. Shaped like a weird aerospace ship and filled with liquid and blobs of some weird waxy substance, the lava lite defies all definition of good taste.
Knowing a little about the tenants who were in this old house in the 1960's, putting a lava lamp on a corner table somewhere might actually be an honor to its history. During an unexpected visit from someone who lived here as a teenager in the 1960's it is confirmed that the house really needed that kind of jazzy light fixture. Evidently times were hard, real hard in this little corner of town during those years. A happy, unbiased, crazy pillar of light and wax would have certainly cheered up the atmosphere.
How to fit that particular device into the overall lighting design is going to be a challenge. Here's a thought. Don't include it in the design at all. Instead, consider the lava lamp as a sort of tchotchke that just sits there looking great as it bubbles and shines. Perhaps it should go in the back office, though. It could be hard to explain to guests how it fits in. What a distraction.